diff --git a/doc/tutorial/basics/aliases.md b/doc/tutorial/basics/aliases.md
index ef96dcf..66f5b71 100644
--- a/doc/tutorial/basics/aliases.md
+++ b/doc/tutorial/basics/aliases.md
@@ -12,6 +12,7 @@
 struct, and they do not appear in the output.
 
 <!-- CUE editor -->
+_alias.cue:_
 ```
 A = a  // A is an alias for a
 a: {
@@ -27,6 +28,7 @@
 ```
 
 <!-- result -->
+`$ cue eval alias.cue`
 ```
 a: {
     d: 3
diff --git a/doc/tutorial/basics/bottom.md b/doc/tutorial/basics/bottom.md
index 8e1bf02..e86cfae 100644
--- a/doc/tutorial/basics/bottom.md
+++ b/doc/tutorial/basics/bottom.md
@@ -16,6 +16,7 @@
 whereas `_|_` is not.
 
 <!-- CUE editor -->
+_bottom.cue:_
 ```
 a: 4
 a: 5
@@ -28,6 +29,7 @@
 ```
 
 <!-- result -->
+`$ cue eval -i bottom.cue`
 ```
 a:    _|_
 l:    _|_
diff --git a/doc/tutorial/basics/bytes.md b/doc/tutorial/basics/bytes.md
index 281d4a2..81b782b 100644
--- a/doc/tutorial/basics/bytes.md
+++ b/doc/tutorial/basics/bytes.md
@@ -14,11 +14,13 @@
 <!-- jba: this contradicts the spec, which has \nnn (no leading zero) -->
 
 <!-- CUE editor -->
+_bytes.cue:_
 ```
 a: '\x03abc'
 ```
 
 <!-- JSON result -->
+`$ cue export bytes.cue`
 ```json
 {
     a: "A2FiYw=="
diff --git a/doc/tutorial/basics/coalesce.md b/doc/tutorial/basics/coalesce.md
index 4c15e62..a3b64bd 100644
--- a/doc/tutorial/basics/coalesce.md
+++ b/doc/tutorial/basics/coalesce.md
@@ -26,6 +26,7 @@
 the result is not of the desired type.
 
 <!-- CUE editor -->
+_coalesce.cue:_
 ```
 list: [ "Cat", "Mouse", "Dog" ]
 
@@ -37,6 +38,7 @@
 ```
 
 <!-- result -->
+`$ cue eval coalesce.cue`
 ```
 list: [ "Cat", "Mouse", "Dog" ]
 
diff --git a/doc/tutorial/basics/commas.md b/doc/tutorial/basics/commas.md
index 66c31fc..e39dae3 100644
--- a/doc/tutorial/basics/commas.md
+++ b/doc/tutorial/basics/commas.md
@@ -14,6 +14,7 @@
 of simple rules._
 
 <!-- CUE editor -->
+_commas.cue:_
 ```
 {
     one: 1
@@ -25,6 +26,7 @@
 
 
 <!-- JSON result -->
+`$ cue export commas.cue`
 ```json
 {
     "one": 1,
diff --git a/doc/tutorial/basics/commaslists.md b/doc/tutorial/basics/commaslists.md
index 710a7ff..c109962 100644
--- a/doc/tutorial/basics/commaslists.md
+++ b/doc/tutorial/basics/commaslists.md
@@ -9,6 +9,7 @@
 The last element of a list may also have a comma.
 
 <!-- CUE editor -->
+_commas2.cue:_
 ```
 [
     1,
@@ -18,6 +19,7 @@
 ```
 
 <!-- JSON result -->
+`$ cue export commas2.cue`
 ```json
 [
     1,
diff --git a/doc/tutorial/basics/comments.md b/doc/tutorial/basics/comments.md
index 256e5b1..5acb4ec 100644
--- a/doc/tutorial/basics/comments.md
+++ b/doc/tutorial/basics/comments.md
@@ -7,6 +7,7 @@
 CUE supports C-style block and line comments.
 
 <!-- CUE editor -->
+_comments.cue:_
 ```
 // whole numbers
 one: 1
@@ -18,6 +19,7 @@
 ```
 
 <!-- JSON result -->
+`$ cue export comments.cue`
 ```json
 {
     "one": 1,
diff --git a/doc/tutorial/basics/conditional.md b/doc/tutorial/basics/conditional.md
index 100ff7c..571efb8 100644
--- a/doc/tutorial/basics/conditional.md
+++ b/doc/tutorial/basics/conditional.md
@@ -12,6 +12,7 @@
 
 
 <!-- CUE editor -->
+_conditional.cue:_
 ```
 price: float
 
@@ -22,6 +23,7 @@
 ```
 
 <!-- result -->
+`$ cue eval conditional.cue`
 ```
 price:         200
 justification: string
diff --git a/doc/tutorial/basics/curly.md b/doc/tutorial/basics/curly.md
index 0c7839e..b19dcf9 100644
--- a/doc/tutorial/basics/curly.md
+++ b/doc/tutorial/basics/curly.md
@@ -8,6 +8,8 @@
 CUE also allows both, which has a specific meaning.
 [We will come back to that later](emit.md).
 
+<!-- CUE editor -->
+_curly.cue:_
 ```
 one: 1
 two: 2
@@ -16,6 +18,7 @@
 ```
 
 <!-- JSON result -->
+`$ cue export curly.cue`
 ```json
 {
     "one": 1,
diff --git a/doc/tutorial/basics/cycle.md b/doc/tutorial/basics/cycle.md
index c9cc4c1..4eda301 100644
--- a/doc/tutorial/basics/cycle.md
+++ b/doc/tutorial/basics/cycle.md
@@ -16,6 +16,7 @@
 
 
 <!-- CUE editor -->
+_cycle.cue:_
 ```
 // CUE knows how to resolve the following:
 x: 200
@@ -28,6 +29,7 @@
 ```
 
 <!-- result -->
+`$ cue eval -i cycle.cue`
 ```
 x: 200
 y: 100
diff --git a/doc/tutorial/basics/cycleref.md b/doc/tutorial/basics/cycleref.md
index f893afd..3f559ef 100644
--- a/doc/tutorial/basics/cycleref.md
+++ b/doc/tutorial/basics/cycleref.md
@@ -10,6 +10,7 @@
 merging them ad infinitum.
 
 <!-- CUE editor -->
+_cycleref.cue:_
 ```
 labels: selectors
 labels: {app: "foo"}
@@ -19,6 +20,7 @@
 ```
 
 <!-- result -->
+`$ cue eval cycleref.cue`
 ```
 labels:    {app: "foo", name: "bar"}
 selectors: {app: "foo", name: "bar"}
diff --git a/doc/tutorial/basics/defaults.md b/doc/tutorial/basics/defaults.md
index a7e59ca..0c4d3bc 100644
--- a/doc/tutorial/basics/defaults.md
+++ b/doc/tutorial/basics/defaults.md
@@ -1,4 +1,4 @@
-[TOC](Readme.md) [Prev](disjunctions.md) [Next](disjstruct.md)
+[TOC](Readme.md) [Prev](disjunctions.md) [Next](sumstruct.md)
 
 _Types ~~and~~ are Values_
 
@@ -15,6 +15,7 @@
 specify either `"tcp"` or `"udp"` as if no marks were given.
 
 <!-- CUE editor -->
+_defaults.cue:_
 ```
 // any positive number, 1 is the default
 replicas: uint | *1
@@ -25,6 +26,7 @@
 ```
 
 <!-- result -->
+`$ cue eval defaults.cue`
 ```
 replicas: 1
 protocol: *"tcp" | *"udp"
diff --git a/doc/tutorial/basics/duplicates.md b/doc/tutorial/basics/duplicates.md
index 7d754cf..08a2d03 100644
--- a/doc/tutorial/basics/duplicates.md
+++ b/doc/tutorial/basics/duplicates.md
@@ -14,6 +14,7 @@
 ([we discuss open-ended lists later](lists.md).)
 
 <!-- CUE editor -->
+_dup.cue:_
 ```
 a: 4
 a: 4
@@ -30,6 +31,7 @@
 ```
 
 <!-- result -->
+`$ cue eval dup.cue`
 ```
 a: 4
 s: {
diff --git a/doc/tutorial/basics/emit.md b/doc/tutorial/basics/emit.md
index 03e25bf..d5cca51 100644
--- a/doc/tutorial/basics/emit.md
+++ b/doc/tutorial/basics/emit.md
@@ -18,6 +18,7 @@
 of defining structs light.
 
 <!-- CUE editor -->
+_emit.cue:_
 ```
 {
     a: A
@@ -29,6 +30,7 @@
 ```
 
 <!-- result -->
+`$ cue eval emit.cue`
 ```
 a: 1
 b: 2
diff --git a/doc/tutorial/basics/fieldcomp.md b/doc/tutorial/basics/fieldcomp.md
index 1f42a30..f2443f3 100644
--- a/doc/tutorial/basics/fieldcomp.md
+++ b/doc/tutorial/basics/fieldcomp.md
@@ -10,6 +10,7 @@
 Instead, one must use indexing.
 
 <!-- CUE editor -->
+_fieldcomp.cue:_
 ```
 import "strings"
 
@@ -25,6 +26,7 @@
 ```
 
 <!-- result -->
+`$ cue eval fieldcomp.cue`
 ```
 barcelona: {
     pos:     1
diff --git a/doc/tutorial/basics/fieldname.md b/doc/tutorial/basics/fieldname.md
index ab33ac9..944b724 100644
--- a/doc/tutorial/basics/fieldname.md
+++ b/doc/tutorial/basics/fieldname.md
@@ -12,6 +12,7 @@
 special characters and does not start with a number:
 
 <!-- CUE editor -->
+_fieldname.cue:_
 ```
 {
     one: 1,
@@ -22,6 +23,7 @@
 ```
 
 <!-- JSON result -->
+`$ cue export fieldname.cue`
 ```json
 {
     "one": 1,
diff --git a/doc/tutorial/basics/fold.md b/doc/tutorial/basics/fold.md
index 952c240..cb1eb0d 100644
--- a/doc/tutorial/basics/fold.md
+++ b/doc/tutorial/basics/fold.md
@@ -7,11 +7,13 @@
 CUE allows a shorthand for structs with single members.
 
 <!-- CUE editor -->
+_fold.cue:_
 ```
 outer middle inner: 3
 ```
 
 <!-- JSON result -->
+`$ cue export fold.cue`
 ```json
 {
     "outer": {
diff --git a/doc/tutorial/basics/foldany.md b/doc/tutorial/basics/foldany.md
index b933eb2..0b6c938 100644
--- a/doc/tutorial/basics/foldany.md
+++ b/doc/tutorial/basics/foldany.md
@@ -10,12 +10,14 @@
 path-leaf pairs without using any curly braces.
 
 <!-- CUE editor -->
+_foldany.cue:_
 ```
 outer middle1 inner: 3
 outer middle2 inner: 7
 ```
 
 <!-- JSON result -->
+`$ cue export foldany.cue`
 ```json
 {
     "outer": {
diff --git a/doc/tutorial/basics/hidden.md b/doc/tutorial/basics/hidden.md
index 03cea5e..02c74a4 100644
--- a/doc/tutorial/basics/hidden.md
+++ b/doc/tutorial/basics/hidden.md
@@ -13,6 +13,7 @@
 with an underscore.
 
 <!-- CUE editor -->
+_hidden.cue:_
 ```
 "_foo": 2
 _foo:   3
@@ -20,7 +21,10 @@
 ```
 
 <!-- result -->
+`$ cue export hidden.cue`
 ```
-"_foo": 2
-foo:    4
+{
+    "_foo": 2,
+    "foo": 4
+}
 ```
diff --git a/doc/tutorial/basics/imports.md b/doc/tutorial/basics/imports.md
index 025b47b..03b923a 100644
--- a/doc/tutorial/basics/imports.md
+++ b/doc/tutorial/basics/imports.md
@@ -21,6 +21,7 @@
 But it is good style to use the factored import statement.
 
 <!-- CUE editor -->
+_imports.cue:_
 ```
 import (
 	"encoding/json"
@@ -31,6 +32,7 @@
 ```
 
 <!-- result -->
+`$ cue eval imports.cue`
 ```
 data: "{\"a\":2.6457513110645907}"
 ```
\ No newline at end of file
diff --git a/doc/tutorial/basics/interpolation.md b/doc/tutorial/basics/interpolation.md
index ba58af1..b13afbd 100644
--- a/doc/tutorial/basics/interpolation.md
+++ b/doc/tutorial/basics/interpolation.md
@@ -10,6 +10,7 @@
 Interpolation may also be used in multiline string and byte literals.
 
 <!-- CUE editor -->
+_interpolation.cue:_
 ```
 "You are \( cost - budget ) dollars over budget!"
 
@@ -18,6 +19,7 @@
 ```
 
 <!-- result -->
+`$ cue eval interpolation.cue`
 ```
 "You are 14 dollars over budget!"
 ```
\ No newline at end of file
diff --git a/doc/tutorial/basics/interpolfield.md b/doc/tutorial/basics/interpolfield.md
index a4140e5..dd07c22 100644
--- a/doc/tutorial/basics/interpolfield.md
+++ b/doc/tutorial/basics/interpolfield.md
@@ -9,6 +9,7 @@
 One cannot refer to generated fields with references.
 
 <!-- CUE editor -->
+_- genfield.cue:_
 ```
 sandwich: {
     type:            "Cheese"
@@ -19,6 +20,7 @@
 ```
 
 <!-- result -->
+`$ cue eval -i genfield.cue`
 ```
 sandwich: {
     type:            "Cheese"
diff --git a/doc/tutorial/basics/listcomp.md b/doc/tutorial/basics/listcomp.md
index 835f704..7d465fb 100644
--- a/doc/tutorial/basics/listcomp.md
+++ b/doc/tutorial/basics/listcomp.md
@@ -10,6 +10,7 @@
 
 
 <!-- CUE editor -->
+_listcomp.cue:_
 ```
 [ x*x for x in items if x rem 2 == 0]
 
@@ -17,6 +18,7 @@
 ```
 
 <!-- result -->
+`$ cue eval listcomp.cue`
 ```
 [4, 16, 36, 64]
 ```
\ No newline at end of file
diff --git a/doc/tutorial/basics/lists.md b/doc/tutorial/basics/lists.md
index 812663c..aadcd6d 100644
--- a/doc/tutorial/basics/lists.md
+++ b/doc/tutorial/basics/lists.md
@@ -21,6 +21,7 @@
 and an invalid one (`yourIP`).
 
 <!-- CUE editor -->
+_lists.cue:_
 ```
 IP: 4 * [ uint8 ]
 
@@ -35,6 +36,7 @@
 ```
 
 <!-- result -->
+`$ cue eval -i lists.cue`
 ```
 IP: [>=0 & <=255, >=0 & <=255, >=0 & <=255, >=0 & <=255]
 PrivateIP:
diff --git a/doc/tutorial/basics/numberlit.md b/doc/tutorial/basics/numberlit.md
index 6bad370..382e6b2 100644
--- a/doc/tutorial/basics/numberlit.md
+++ b/doc/tutorial/basics/numberlit.md
@@ -8,6 +8,7 @@
 CUE adds a variety of sugar for writing numbers.
 
 <!-- CUE editor -->
+_numlit.cue:_
 ```
 [
     1_234,       // 1234
@@ -18,6 +19,7 @@
 ```
 
 <!-- JSON result -->
+`$ cue export numlit.cue`
 ```json
 [
     1234,
diff --git a/doc/tutorial/basics/numbers.md b/doc/tutorial/basics/numbers.md
index 442d626..f703f45 100644
--- a/doc/tutorial/basics/numbers.md
+++ b/doc/tutorial/basics/numbers.md
@@ -1,4 +1,4 @@
-[TOC](Readme.md) [Prev](defaults.md) [Next](ranges.md)
+[TOC](Readme.md) [Prev](sumstruct.md) [Next](ranges.md)
 
 _Types ~~and~~ are Values_
 
@@ -15,6 +15,7 @@
 used as an `int` without conversion.
 
 <!-- CUE editor -->
+_numbers.cue:_
 ```
 a: int
 a: 4 // type int
@@ -29,6 +30,7 @@
 ```
 
 <!-- result -->
+`$ cue eval -i numbers.cue`
 ```
 a: 4
 b: 4.0
diff --git a/doc/tutorial/basics/operators.md b/doc/tutorial/basics/operators.md
index 12f7e6d..6512c97 100644
--- a/doc/tutorial/basics/operators.md
+++ b/doc/tutorial/basics/operators.md
@@ -12,6 +12,7 @@
 and truncated division (`quo` and `rem`).
 
 <!-- CUE editor -->
+_op.cue:_
 ```
 a: 3 / 2   // type float
 b: 3 div 2 // type int: Euclidean division
@@ -23,6 +24,7 @@
 ```
 
 <!-- result -->
+`$ cue eval -i op.cue`
 ```
 a: 1.5
 b: 1
diff --git a/doc/tutorial/basics/packages.md b/doc/tutorial/basics/packages.md
index 73b346f..b460e40 100644
--- a/doc/tutorial/basics/packages.md
+++ b/doc/tutorial/basics/packages.md
@@ -17,7 +17,7 @@
 in the same outcome, given that order does not matter.
 
 <!-- CUE editor tab 1-->
-File a.cue
+_a.cue:_
 ```
 package config
 
@@ -26,7 +26,7 @@
 ```
 
 <!-- CUE editor tab 2-->
-File b.cue
+_b.cue:_
 ```
 package config
 
@@ -34,7 +34,7 @@
 ```
 
 <!-- result -->
-Result
+`$ cue eval a.cue b.cue`
 ```
 foo: 100
 bar: 200
diff --git a/doc/tutorial/basics/rangedef.md b/doc/tutorial/basics/rangedef.md
index d29e4e8..4c49c6a 100644
--- a/doc/tutorial/basics/rangedef.md
+++ b/doc/tutorial/basics/rangedef.md
@@ -27,6 +27,7 @@
 ```
 
 <!-- CUE editor -->
+_range.cue:_
 ```
 positive: uint
 byte:     uint8
@@ -40,6 +41,7 @@
 ```
 
 <!-- result -->
+`$ cue eval -i range.cue`
 ```
 a: _|_
 b: 128
diff --git a/doc/tutorial/basics/ranges.md b/doc/tutorial/basics/ranges.md
index 548845b..5f8fcc8 100644
--- a/doc/tutorial/basics/ranges.md
+++ b/doc/tutorial/basics/ranges.md
@@ -13,6 +13,7 @@
 whereas `<0` allows all negative numbers (int or float).
 
 <!-- CUE editor -->
+_bounds.cue:_
 ```
 rn: >=3 & <8        // type int | float
 ri: >=3 & <8 & int  // type int
@@ -31,6 +32,7 @@
 ```
 
 <!-- result -->
+`$ cue eval -i bounds.cue`
 ```
 a:  3.5
 b:  _|_
diff --git a/doc/tutorial/basics/regexp.md b/doc/tutorial/basics/regexp.md
index 08ee835..1b472f6 100644
--- a/doc/tutorial/basics/regexp.md
+++ b/doc/tutorial/basics/regexp.md
@@ -14,6 +14,7 @@
 
 
 <!-- CUE editor -->
+_regexp.cue:_
 ```
 a: "foo bar" =~ "foo [a-z]{3}"
 b: "maze" !~ "^[a-z]{3}$"
@@ -28,6 +29,7 @@
 ```
 
 <!-- result -->
+`$ cue eval -i regexp.cue`
 ```
 a: true
 b: true
diff --git a/doc/tutorial/basics/scopes.md b/doc/tutorial/basics/scopes.md
index f31bed7..429dbfd 100644
--- a/doc/tutorial/basics/scopes.md
+++ b/doc/tutorial/basics/scopes.md
@@ -13,6 +13,7 @@
 If there is still no match, it may match a predefined value.
 
 <!-- CUE editor -->
+_scopes.cue:_
 ```
 v: 1
 a: {
@@ -26,6 +27,7 @@
 ```
 
 <!-- result -->
+`$ cue eval scopes.cue`
 ```
 v: 1
 a: {
diff --git a/doc/tutorial/basics/selectors.md b/doc/tutorial/basics/selectors.md
index f48c4cf..1547e81 100644
--- a/doc/tutorial/basics/selectors.md
+++ b/doc/tutorial/basics/selectors.md
@@ -10,6 +10,7 @@
 
 
 <!-- CUE editor -->
+_selectors.cue:_
 ```
 a: {
     b: 2
@@ -20,6 +21,7 @@
 ```
 
 <!-- result -->
+`$ cue eval selectors.cue`
 ```
 a: {
     b:     2
diff --git a/doc/tutorial/basics/stringlit.md b/doc/tutorial/basics/stringlit.md
index 33cf7d6..c5e90c6 100644
--- a/doc/tutorial/basics/stringlit.md
+++ b/doc/tutorial/basics/stringlit.md
@@ -15,6 +15,7 @@
 Strings may also contain [interpolations](interpolation.md).
 
 <!-- CUE editor -->
+_stringlit.cue:_
 ```
 // 21-bit unicode characters
 a: "\U0001F60E" // 😎
@@ -27,9 +28,10 @@
 ```
 
 <!-- JSON result -->
+`$ cue extract stringlit.cue`
 ```json
 {
-    a: "😎"
-    b: "Hello\nWorld!"
+    "a": "😎",
+    "b": "Hello\nWorld!"
 }
 ```
diff --git a/doc/tutorial/basics/stringraw.md b/doc/tutorial/basics/stringraw.md
index 6f5b73a..8ea44fa 100644
--- a/doc/tutorial/basics/stringraw.md
+++ b/doc/tutorial/basics/stringraw.md
@@ -13,6 +13,7 @@
 Quotes do not have to be escaped in such strings.
 
 <!-- CUE editor -->
+_stringraw.cue:_
 ```
 msg1: #"The sequence "\U0001F604" renders as \#U0001F604."#
 
@@ -21,11 +22,13 @@
 
         #"\d{3}"#
 
-    This construct works for bytes, strings and their multi-line variants.
+    This construct works for bytes, strings and their
+    multi-line variants.
     """##
 ```
 
 <!-- JSON result -->
+`$ cue eval stringraw.cue`
 ```json
 {
     msg1: "The sequence \"\\U0001F604\" renders as 😄."
@@ -34,7 +37,8 @@
         
             #\"\\d{3}\"#
         
-        This construct works for bytes, strings and their multi-line variants.
+        This construct works for bytes, strings and their
+        multi-line variants.
         """
 }
 ```
diff --git a/doc/tutorial/basics/disjstruct.md b/doc/tutorial/basics/sumstruct.md
similarity index 97%
rename from doc/tutorial/basics/disjstruct.md
rename to doc/tutorial/basics/sumstruct.md
index 5cbc9ac..25e76a4 100644
--- a/doc/tutorial/basics/disjstruct.md
+++ b/doc/tutorial/basics/sumstruct.md
@@ -10,6 +10,7 @@
 has an exit on level 0 and 1, but not on any other floor.
 
 <!-- CUE editor -->
+_sumstruct.cue:_
 ```
 // floor defines the specs of a floor in some house.
 floor: {
diff --git a/doc/tutorial/basics/templates.md b/doc/tutorial/basics/templates.md
index bd40c2a..154e997 100644
--- a/doc/tutorial/basics/templates.md
+++ b/doc/tutorial/basics/templates.md
@@ -13,6 +13,8 @@
 of its sibling fields and is visible within the template value
 that is unified with each of the siblings.
 
+<!-- CUE editor -->
+_templates.cue:_
 ```
 // The following struct is unified with all elements in job.
 // The name of each element is bound to Name and visible in the struct.
@@ -30,6 +32,8 @@
 }
 ```
 
+<!-- JSON result -->
+`$ cue eval templates.cue`
 ```
 job: {
     list: {
diff --git a/doc/tutorial/basics/types.md b/doc/tutorial/basics/types.md
index e0f80da..aa8c870 100644
--- a/doc/tutorial/basics/types.md
+++ b/doc/tutorial/basics/types.md
@@ -36,6 +36,7 @@
 
 
 <!-- CUE editor -->
+_types.cue:_
 ```
 point: {
     x: float
@@ -52,6 +53,7 @@
 ```
 
 <!-- result -->
+`$ cue eval types.cue`
 ```
 point: {
     x: float
diff --git a/doc/tutorial/basics/unification.md b/doc/tutorial/basics/unification.md
index bbca5ef..b28ecf8 100644
--- a/doc/tutorial/basics/unification.md
+++ b/doc/tutorial/basics/unification.md
@@ -16,6 +16,7 @@
 in any order always gives the same result.
 
 <!-- CUE editor -->
+_unification.cue:_
 ```
 a: { x: 1, y: 2 }
 b: { y: 2, z: 3 }
@@ -27,6 +28,7 @@
 ```
 
 <!-- result -->
+`$ cue eval -i unification.cue`
 ```
 a: { x: 1, y: 2 }
 b: { y: 2, z: 3 }