sentence: Woman throws a throwing knife at board. sentence:   Three men throw knives. sentence:   Knives hit a board. sentence:   Two men throw throwing knives backwards. sentence:   Man throws throwing knife. sentence:   Woman throws throwing knife. sentence:   A man and woman throw throwing knives. sentence:   Man throws knife while laying down. sentence:   Man demonstrates techniques to students. sentence:   Dojo members practice techniques. sentence:   Dojo members bow to the man.