parts:
    "b": "data/maps/tutorial3/blocker_sm.fus"
collmap:
    ;;
    ;;       .   .   .   .   ?   .   .   .   .   .   .   .            [b]
    ;;
    ;;     .   .   .   .   .   .   .   ?   .   .   .   .   .              [b]
    ;;
    ;;   .   .   .   ?   .   .   .   .   .   .   ?   .   .  (.)    [b]     [b]
    ;;
    ;; .   .   ?   .   .   .   .   .   ?   .   ?   .   ?   .      [b]  [b] [b][b]
    ;;