i = 1 4,0&9,1: 20 i = 2 4,1&29,0: 10 i = 3 14,0&29,-1: 20 i = 4 14,-1&9,0: 10 ........................................ ........................................ ........................................ ........................................ .........*===================*.......... .........|###################|.......... .........|###################|.......... .........|###################|.......... .........|###################|.......... .........|###################|.......... .........|###################|.......... .........|###################|.......... .........|###################|.......... .........|###################|.......... .........*===================*.......... ........................................ ........................................ ........................................ ........................................ ........................................