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rrxxxxxxx|.....|xxxxxxx|
rrxxxxxxx|.|...|xxxxxxx|
rrxxxxxxx|L|...|xxxxxxx|
rr_________+FFF+_______+
rrrrrrrrrrrF...........
rrrrrrrrrrrF...........
rrrrrrrrrrrF...........
rr_____________________+
rrxxxxxxxxxxxxxxxxxxxxx|
rrxxxxxxxxxxxxxxxxxxxxx|

r ->River
x -> ground
. -> hallway
L -> lever
| - and + -> walls