19 numbers. Math puzzle

Incredibly addictive number puzzle «19 numbers»! The best pumping for the mind! Developing logical thinking, mathematical puzzle «19 numbers», also known as «Numbers», «Game of ten», «Column», «Seeds and fortune Telling», «Seeds» was very popular in the USSR among pupils and students. The rules are simple: you need to clear the playing field of all the numbers by removing pairs of identical numbers or pairs that give ten. If there are no moves left, then all the remaining numbers are written from the last cell.