On unlearning:
There is a well known phenomenon in children's acquisition of English. At first they learn past tense forms by rote, including irregular forms, like sang, went, flew, and quit. Later they learn the rule for forming the past tense and unlearn (inhibit) the irregular forms, replacing them with singed, goed, flied, and quitted. Later they relearn the irregular forms, inhibiting the regular rule.
This process is similar to learning tesuji at go. First, the beginner acquires zokusuji. E. g., atari. Then he learns to inhibit zokusuji and play tesuji. E. g., Don't play atari, play geta. Don't play atari, threaten to play atari. Don't play atari, extend. He learns the mocking phrase,
Atari, atari!, as a way of inhibiting atari. Later he learns situations where the zokusuji is correct,
Zokusuji nagara. This may involve inhibiting tesuji.
variation 3. 
