Types of Error 

See D. E. Knuth, _Literate Programming_, 1992, ISBN 0-937073-80-6, pp. 245-247. 

A    an algorithm awry.

B    a blunder or botch.

C    a cleanup for consistency or clarity.

D    a data structure debacle.

E    an efficiency enhancement.

F    a forgotten function.

G    a generalization or growth of ability.

I    an interactive improvement.

L    a language liability.

M    a mismatch between modules.

P    a promotion of portability.

Q    a quest for quality.

R    a reinforcement for robustness.

S    a surprising scenario.

T    a trivial typo.