Ключевые слова: background, black, blackboard, block, board, chalk, competition, concept, cross, drawing, education, frame, fun, game, grid, hand, intelligence, intelligent, letter, letterpress, marble, math, noughts, object, play, school, sign, sketch, smart, square, strategy, success, tac, texture, tic, tictactoe, toe, white, win, wood, wooden, x,