I remember a daughter in the first grade decides: “My grandfather and grandmother had 5 goats. They ate one. How many goats are left, first is the reef. Hussey is sorry. Then he starts adding all-grandfather, grandmother and goose. I say – what are you doing? Why do you add Grandpa and Grandpa? She thinks for a long time, and then shouts joyfully – I understand... They need to be taken from the goats! And then the goats will be whole!