92. 50 chess pieces are arranged in a circle, and numbers $1, 2, 3, \cdots \cdots$ 50 are sequentially marked on the chess pieces in a clockwise direction. Then, in a clockwise direction, every other chess piece is removed until only one chess piece remains. If the number of the remaining chess piece is 42, then the first chess piece to be taken away is $\qquad$ number chess piece.
answer: 7