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+This directory contains earlier prototypes.
+
+* 1.vm.arc: an early prototype of a statement-oriented interpreted language
+  built in Arc. Now has its own repo at
+  [mu0](https://github.com/akkartik/mu0).
+
+* 2.vm: a statement-oriented interpreted language. Now has its own repo at
+  [mu1](https://github.com/akkartik/mu1).
+
+* 3.transect: an abortive design for a safe low-level language with manual
+  register allocation.