unravel, notes, key, explanation, understanding, untie, undo, solve, answer, cancel, absolve, explain, minute
カイ / と.く
chop, divide, tear, analyze
セキ / —
how many, how much, how far, how long, some, several
キ / いく-
what
カ / なに
study, learning, science
ガク / まな.ぶ