diff --git a/collects/2htdp/langs.txt b/collects/2htdp/langs.txt
new file mode 100644
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+;; design points for bsl/isl/asl in 2htdp
+
+*** '() will be the empty list 
+
+*** bsl: current bsl - symbols + '() 
+*** isl: lambda + local 
+*** isl+: symbols, quoted and backquoted S-expressions