How did you do in your primary school math exam? I want to sign up for a class during the holiday. Do you have any recommendations?
Not bad, al
Update 1: Not every copy must be the same.
That means: cut one knife: 2+2 cut two knives: 4+4 cut three knives: 8+6 cut four knives: 14+8 cut five knives: 22+ 1