difficult / hard, probably impossible

演算子: (mathematics, computing) operator

演算: to calculate

演算: operation

演算機: processor / 演算器: functional unit (e.g. in analog computing)

first, number one / game, round

most, -est, -most

(Kagoshima, dialect) most / (Kagoshima, dialect) first

a (single) pair, couple, brace (male-female pair of animals) / (gagaku, bugaku, dance) a style of performance consisting of pairs of left and right dances

mathematics (field of study)