0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 0 ........................................ ........................................ ........*================*.............. ........|#################\............. ........|##################\............ ........|##|.............\##\........... ........|##|..............\##\.......... ........|##|...............*..*......... ........|##|...............|##|......... ........|##|...............|##|......... ........|##|...............|##|......... ........|##|...............|##|......... ........|##|...............*..*......... ........|##|............../##/.......... ........|##|............./##/........... ........|##|.*==========*../............ ########|..|#|............/..########### ........*==*.*===========*.............. ........................................ ........................................