diff --git a/data/dummy_examples/Makefile b/data/dummy_examples/Makefile
new file mode 100644
index 0000000..9355a77
--- /dev/null
+++ b/data/dummy_examples/Makefile
@@ -0,0 +1,15 @@
+# make the .json data from the .egg files in this directory
+# run make from this directory
+# FIXME this doesn't quite work yet, egglog
+# doesn't export roots properly
+
+egg_files = $(wildcard *.egg)
+json_files = $(egg_files:.egg=.json)
+
+all: $(json_files)
+
+egglog_manifest = ../../../egglog/Cargo.toml
+
+%.json: %.egg
+	cargo run --manifest-path $(egglog_manifest) -- $< --to-json
+	
\ No newline at end of file
diff --git a/data/dummy_examples/ab_add.egg b/data/dummy_examples/ab_add.egg
index e42ede0..1b42c72 100644
--- a/data/dummy_examples/ab_add.egg
+++ b/data/dummy_examples/ab_add.egg
@@ -7,10 +7,10 @@
 ; DAG extraction notices that balanced trees are much cheaper
 ; Optimal tree is (let t1 (a + b) in let t2 = (t1 + t1) in (t2 + t2)
 ; Which is cost 5 and proportional to the logarithm of the number of nodes
-(define A2 (Add (A) (A)))
-(define A4 (Add A2 A2))
-(define B2 (Add (B) (B)))
-(define B4 (Add B2 B2))
-(define t (Add A4 B4))
+(let A2 (Add (A) (A)))
+(let A4 (Add A2 A2))
+(let B2 (Add (B) (B)))
+(let B4 (Add B2 B2))
+(let t (Add A4 B4))
 
 (run 10)
diff --git a/data/dummy_examples/ab_add.json b/data/dummy_examples/ab_add.json
index d1f1f4e..6f9a03c 100644
--- a/data/dummy_examples/ab_add.json
+++ b/data/dummy_examples/ab_add.json
@@ -1,513 +1,445 @@
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 }
\ No newline at end of file
diff --git a/data/dummy_examples/choice.egg b/data/dummy_examples/choice.egg
index 73b1336..ea48c77 100644
--- a/data/dummy_examples/choice.egg
+++ b/data/dummy_examples/choice.egg
@@ -6,7 +6,7 @@
 ; Tree extraction would pick (g (x n))
 ; Dag extraction notices the shared subterm A B across choices and makes the opposite choice.
 ; A and B are amoritized across uses, so cost (f n A B) ~ 1
-(define t
+(let t
     (Cons  (g (x 0))
     (Cons  (g (x 1))
     (Cons  (g (x 2))
diff --git a/data/dummy_examples/choice.json b/data/dummy_examples/choice.json
new file mode 100644
index 0000000..9dfa5c6
--- /dev/null
+++ b/data/dummy_examples/choice.json
@@ -0,0 +1,937 @@
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diff --git a/data/dummy_examples/loop.egg b/data/dummy_examples/loop.egg
index 0c1e8b4..709ba50 100644
--- a/data/dummy_examples/loop.egg
+++ b/data/dummy_examples/loop.egg
@@ -7,7 +7,7 @@
 ; We pick enode e = (Mul (One) e)  
 
 
-(define t 
+(let t 
     (Mul (One) (foo (foo (foo (foo (One))))
 )))
 (run 1)
diff --git a/data/dummy_examples/loop.json b/data/dummy_examples/loop.json
index 92e4fc7..bfcf051 100644
--- a/data/dummy_examples/loop.json
+++ b/data/dummy_examples/loop.json
@@ -1,113 +1,71 @@
 {
-    "nodes": {
-        "v2___-0": {
-            "op": "v2___",
-            "children": [],
-            "eclass": "5",
-            "cost": 9.223372036854776e18
-        },
-        "t-0": {
-            "op": "t",
-            "children": [],
-            "eclass": "5",
-            "cost": 9.223372036854776e18
-        },
-        "v1___-0": {
-            "op": "v1___",
-            "children": [],
-            "eclass": "0",
-            "cost": 9.223372036854776e18
-        },
-        "v3___-0": {
-            "op": "v3___",
-            "children": [],
-            "eclass": "3",
-            "cost": 9.223372036854776e18
-        },
-        "One-0": {
-            "op": "One",
-            "children": [],
-            "eclass": "0",
-            "cost": 1.0
-        },
-        "v4___-0": {
-            "op": "v4___",
-            "children": [],
-            "eclass": "2",
-            "cost": 9.223372036854776e18
-        },
-        "foo-0": {
-            "op": "foo",
-            "children": [
-                "One-0"
-            ],
-            "eclass": "1",
-            "cost": 1.0
-        },
-        "foo-5871781006564002453": {
-            "op": "foo",
-            "children": [
-                "foo-0"
-            ],
-            "eclass": "2",
-            "cost": 1.0
-        },
-        "foo-11743562013128004906": {
-            "op": "foo",
-            "children": [
-                "foo-5871781006564002453"
-            ],
-            "eclass": "3",
-            "cost": 1.0
-        },
-        "foo-17615343019692007359": {
-            "op": "foo",
-            "children": [
-                "foo-11743562013128004906"
-            ],
-            "eclass": "5",
-            "cost": 1.0
-        },
-        "v0___-0": {
-            "op": "v0___",
-            "children": [],
-            "eclass": "5",
-            "cost": 9.223372036854776e18
-        },
-        "v5___-0": {
-            "op": "v5___",
-            "children": [],
-            "eclass": "1",
-            "cost": 9.223372036854776e18
-        },
-        "Mul-10912160959110460649": {
-            "op": "Mul",
-            "children": [
-                "v1___-0",
-                "t-0"
-            ],
-            "eclass": "5",
-            "cost": 1.0
-        }
+  "nodes": {
+    "Mul-5040379952546458196": {
+      "op": "Mul",
+      "children": [
+        "One-0",
+        "Mul-5040379952546458196"
+      ],
+      "eclass": "5",
+      "cost": 1.0
     },
-    "root_eclasses": [
-        "5"
-    ],
-    "class_data": {
-        "5": {
-            "type": "Math"
-        },
-        "0": {
-            "type": "Math"
-        },
-        "3": {
-            "type": "Math"
-        },
-        "2": {
-            "type": "Math"
-        },
-        "1": {
-            "type": "Math"
-        }
+    "One-0": {
+      "op": "One",
+      "children": [],
+      "eclass": "0",
+      "cost": 1.0
+    },
+    "foo-0": {
+      "op": "foo",
+      "children": [
+        "One-0"
+      ],
+      "eclass": "1",
+      "cost": 1.0
+    },
+    "foo-5871781006564002453": {
+      "op": "foo",
+      "children": [
+        "foo-0"
+      ],
+      "eclass": "2",
+      "cost": 1.0
+    },
+    "foo-11743562013128004906": {
+      "op": "foo",
+      "children": [
+        "foo-5871781006564002453"
+      ],
+      "eclass": "3",
+      "cost": 1.0
+    },
+    "foo-17615343019692007359": {
+      "op": "foo",
+      "children": [
+        "foo-11743562013128004906"
+      ],
+      "eclass": "5",
+      "cost": 1.0
+    }
+  },
+  "root_eclasses": [
+    "5"
+  ],
+  "class_data": {
+    "5": {
+      "type": "Math"
+    },
+    "0": {
+      "type": "Math"
+    },
+    "1": {
+      "type": "Math"
+    },
+    "2": {
+      "type": "Math"
+    },
+    "3": {
+      "type": "Math"
     }
+  }
 }
\ No newline at end of file