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                        covered({tee,_,X,Y,1}) -> [{X,Y},{X-1,Y-1},{X-1,Y},{X-1,Y+1}];
covered({tee,_,X,Y,2}) -> [{X,Y},{X,Y+1},{X+1,Y+1},{X-1,Y+1}];
covered({tee,_,X,Y,3}) -> [{X,Y},{X+1,Y},{X+1,Y+1},{X+1,Y-1}];
covered({tee,_,X,Y,4}) -> [{X,Y},{X,Y-1},{X+1,Y-1},{X-1,Y-1}];
covered({l1,_,X,Y,1})  -> [{X+1,Y-1},{X+1,Y},{X+1,Y+1},{X,Y+1}];
covered({l1,_,X,Y,2})  -> [{X-1,Y-1},{X,Y-1},{X+1,Y-1},{X+1,Y}];
covered({l1,_,X,Y,3})  -> [{X-1,Y-1},{X-1,Y},{X-1,Y+1},{X,Y-1}];
covered({l1,_,X,Y,4})  -> [{X-1,Y+1},{X,Y+1},{X+1,Y+1},{X-1,Y}];
covered({l2,_,X,Y,1})  -> [{X+1,Y-1},{X+1,Y},{X+1,Y+1},{X,Y-1}];
covered({l2,_,X,Y,2})  -> [{X-1,Y-1},{X,Y-1},{X+1,Y-1},{X-1,Y}];
covered({l2,_,X,Y,3})  -> [{X-1,Y-1},{X-1,Y},{X-1,Y+1},{X,Y+1}];
covered({l2,_,X,Y,4})  -> [{X-1,Y+1},{X,Y+1},{X+1,Y+1},{X+1,Y}];
covered({bar,_,X,Y,1}) -> [{X,Y},{X-1,Y},{X+1,Y},{X+2,Y}];
covered({bar,_,X,Y,2}) -> [{X+1,Y},{X+1,Y+1},{X+1,Y-1},{X+1,Y-2}];
covered({bar,_,X,Y,3}) -> [{X+2,Y-1},{X-1,Y-1},{X,Y-1},{X+1,Y-1}];
covered({bar,_,X,Y,4}) -> [{X,Y-2},{X,Y-1},{X,Y},{X,Y+1}];
covered({r1,_,X,Y,1})  -> [{X,Y},{X+1,Y},{X,Y+1},{X-1,Y+1}];
covered({r1,_,X,Y,2})  -> [{X,Y},{X,Y-1},{X+1,Y},{X+1,Y+1}];
covered({r1,_,X,Y,3})  -> [{X,Y},{X+1,Y-1},{X,Y-1},{X-1,Y}];
covered({r1,_,X,Y,4})  -> [{X,Y},{X-1,Y-1},{X-1,Y},{X,Y+1}];
covered({r2,_,X,Y,1})  -> [{X,Y},{X+1,Y},{X-1,Y-1},{X,Y-1}];
covered({r2,_,X,Y,2})  -> [{X,Y},{X,Y-1},{X-1,Y+1},{X-1,Y}];
covered({r2,_,X,Y,3})  -> [{X,Y},{X-1,Y},{X+1,Y+1},{X,Y+1}];
covered({r2,_,X,Y,4})  -> [{X,Y},{X,Y+1},{X+1,Y},{X+1,Y-1}];
covered({box,_,X,Y,_})  -> [{X,Y},{X,Y+1},{X+1,Y},{X+1,Y+1}].