A equals open parentheses table row cell 1 space space space end cell cell 2 space space space space space 3 end cell end table close parentheses space space space space space comma space space space space B equals open parentheses table row cell 1 space space space end cell cell negative 1 space space space space space space 0 end cell end table close parentheses فان A plus B equals
open parentheses table row cell 1 space space space space space 2 space space space space end cell 3 end table close parentheses
right to left ϕ
open parentheses table row cell 2 space space space end cell cell 1 space space space space space 3 end cell end table close parentheses
open parentheses space 6 space close parentheses
