A equals open parentheses table row 1 row 2 row 3 end table close parentheses space comma space space space space space B equals open parentheses table row cell negative 1 end cell row 0 row 1 end table close parentheses فان A minus B equals
right to left ϕ
open parentheses table row cell 1 space space end cell cell 2 space space end cell 3 end table close parentheses
open parentheses table row 1 row 2 row 3 end table close parentheses
open parentheses table row 2 row 2 row 2 end table close parentheses