Allowed Feet Positions

• the number of possible foot positions:

(n - h1 + 1) (n - hm + 1) (m - v1 + 1) (m - vn + 1) ??m2 n2

• two consecutive feet have a non-empty intersection

( PN ? PW ??? AND PS ? PE ??? ) OR

( PN ? PE ??? AND PS ? PW ??? )

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