Imagine a game board and try to get "boundary condition"...
where:- blue arrows shows "far left" and "far right" cases;
- red arrows shows situation that will never happend (probability 0).
Also imagine "missing of a peg" situation,
where:- blue arrows shows that ball goes forward to the bottom with the same probability as it has before.
Test case from problem description
1st test case from example input
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