Vocabulary consisting only from characters you are able to read
必死
ひっし
(1)frantic/desperate/ (2)inevitable death/ (3)brinkmate (inevitable checkmate) (shogi)/(P) adj, leda1
僕
ぼく
I (used by men with close acquaintances)jlpt4
垂線
すいせん
perpendicular linemath
叩く
たたく
(1)to strike, to clap, to knock, to dust, to beat, (2)to play drums, (3)to abuse, to flame (e.g. on the Internet), to insult godan, jlpt3, verb, vtrans
解ける
とける
(1)to be solved, (2)to loosen, to come untied, (3)to be removed (e.g. restrictions), to be cleared (e.g. misunderstandings), to be broken (e.g. spells, curses), (4)to melt ichidan, jlpt3, verb, vintrans