class="bi x0 y0 w1 h1"
class="bi x0 y1 w1 h2"
class="bi x0 y2 w1 h3"
class="bi x0 y3 w1 h4"
class="bi x1 y4 w2 h5"
class="bi x1 y5 w2 h6"
class="bi x1 y6 w2 h7"
class="bi x1 y7 w2 h8"
class="bi x1 y5 w2 h6"
class="bi x1 y8 w2 h9"