Ключевые слова: american, ball, blackboard, board, chalk, chalkboard, coach, competition, concept, conceptual, defense, diagram, drawing, drawn, explaining, field, football, game, hand, hold, holding, instruct, lesson, map, organization, plan, play, quarterback, receiver, rugby, running, safety, score, sketch, sport, sports, strategy, tactic, teach, team, teamwork, together, trainer, training, white, writing, written,