$%1 = %0$BOX $=$ BOX

$%1 = %0$BOX $=$ BOX

$%1 = %0$BOX $=$ BOX

$%1 = %0$BOX $=$ BOX

$%0 = $ BOX $\times\quad$ BOX $=$ BOX

$%0 = $

BOX

BOX

$=$ BOX