(0
   qqqxqq          x x   x          x                     x
      x         nqqn nqqqxqqq       x                    xx
  x x x   x     x  nqn  xx        qqnq       x    qqqq   nqqnqq
  xxqqwqqqxqqqq x    x  xnqqqqq     x    qqqqxqq    x     x x
  xxx x  xx  x  nnqqqq  xx          xx       xx    xx   x x xx  x
  x x x  xx  xqqnxqqqqq xxxqqqqqxqqqxxqqqxqqqqxqq  x    xqqq x  x
  nqxqqqqnxqqu   x   x qqq      xqqqqxq      x     x nq    xqqqqqqx
  x   x  xx  x qqxqqqx  x       xx       xqqqxx    x  xqqq  x   x x
  qq      xx     n   x  x   x   xx   qqq  xqqxxx    xqqq   xx  qnqqq
  x    qqqqu  qqqqqqqxqqq   xqqqq    qqqqqx  qqxqqqqn qqqqq nq  x x
           x         x  x   n   x         x nqqqqq  x    x        x
     x     x  x      x  x       x    x      x  x    n    x      n
  qqqxqqqqqxqqnqq   nnqqqq      x    x      xnqq    x   xx    x
     x     x qxqqqqqvqqqxq      n   qnxq     x          nn    n
              x      x  x            xx                 x  qqqn
                                     x
(B