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Sam Tobin-Hochstadt 6514ee71e1 Refactor substitution.
- new file types/substitute
 - use structs for substitutions

original commit: 44d46e4cd7ecc06a264282b31dd7ba47dee421f1
2010-06-21 18:30:28 -04:00
collects Refactor substitution. 2010-06-21 18:30:28 -04:00