Ключевые слова: 2020, above, assembling, background, block, blue, challenge, classic, closeup, completing, concept, connection, construct, construction, detached, education, element, fit, flat, game, heap, jigsaw, join, l, leisure, lost, missing, object, part, piece, pile, play, preschoo, problem, puzzle, set, shadow, shape, solution, stack, text, tiling, togetherness, top, toy, type, view,