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when toggle format what by license comment
Nov 5, 2015 at 21:34 comment added Rick Decker Right track, but you're interpreting things backwards. For example, starting with two $a$'s, you could follow with 1 or more $b$'s, not 4 or more.
Nov 5, 2015 at 21:26 history answered TLW CC BY-SA 3.0