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diff --git a/rt/docs/design_docs/rql_parser_machine.graphviz b/rt/docs/design_docs/rql_parser_machine.graphviz
deleted file mode 100644
index 93ea989c1..000000000
--- a/rt/docs/design_docs/rql_parser_machine.graphviz
+++ /dev/null
@@ -1,35 +0,0 @@
-
-/* GraphViz graph representing the state diagram of the RQL parser.
-*/
-
-/* XXX: It's not up to date anymore, we should delete it or update.
-*/
-
-digraph G {
-
-    PAREN -> PAREN;
-    PAREN -> KEYWORD;
-    PAREN -> AGGREG;
-
-    AGGREG -> KEYWORD;
-    AGGREG -> PAREN;
-
-    KEYWORD -> OP;
-
-    OP -> VALUE;
-
-    VALUE -> PAREN;
-    VALUE -> AGGREG;
-
-/*
-    Blue lines represent added complexity of q[IN (x,y,z)] support.
-    The only place that the "blue tree" can be entered is at IN, and
-    exited at PAREN.
-*/
-    KEYWORD -> IN [color=blue];
-    IN -> PAREN [color=blue];
-    PAREN -> VALUE [color=blue];
-    VALUE -> COMMA [color=blue];
-    COMMA -> VALUE [color=blue]; 
-    VALUE -> PAREN [color=blue];
-}