Vocabulary consisting only from characters you are able to read
正解
せいかい
correct/right/correct interpretation (answer, solution)/(P)suru, verb
有無
うむ
(1)existence or nonexistence, presence or absence, (2)consent or refusal, yes or no, (3)(comp) flag indicator, presence or absence marker; (n) (4)existence or nonexistence, presence or absence, (2 mix
初めに
はじめに
in the beginning, at firstjlpt5