LevelMapping
    a > tree 
    b > fastRtruck 
    c > slowRtruck 
    d > moving 
    e > slowLtruck 
    f > fastLtruck 
    g > dead 

LevelDescription
aaaaaaaaaaaaaa
a      b   c a
a      de    a
a            a
a     aaa    a
a    f       a
a            a
a     b      a
a   c   b  a a
a   b   c cafa
a         aa a
a g    b  a  a
aaaaaaaaaaaaaa