Ключевые слова: backgrounds, balance, black, blackboard, blank, business, calculating, calender, chalk, chalkboard, change, check, checklist, closeup, concept, count, counting, dash, day, death, draw, drawing, education, election, green, growth, handwriting, line, list, mathematical, mathematics, month, row, school, streak, striped, symbol, tally, text, vote, voting, waiting, white, writing,