B w h

B w hB w hB w hB w h
B w hB w hB w hB w hB w hB w hB w hB w h
B w hB w hB w hB w hB w hB w hB w hB w hB w hB w hB w hB w h
B w hB w hB w hB w hB w hB w hB w hB w hB w hB w hB w hB w hB w hB w hB w hB w h
B w hB w hB w hB w hB w hB w hB w hB w h