updates opposite to step 1
_two . second = ( _two . second + 1 ) % size2 ; if ( _two . second == 0 ) _two . first = ( _two . first + 1 ) % size2 ; } else { Console . Write ( " [ " + a2 [ _one . second ] + " , ▁ " + a1 [ _one . first ] + " ] ▁ " ) ;