pipeDreams -- computes the set of reduced pipe dreams corresponding to a permutation

Given a permutation in one line notation, finds the set of reduced pipe dreams. Each element of the output is a square array containing "+" and "/" symbols. The "+" symbols are interpreted as crossing tiles and the "/" are interpreted as bump tiles. Starting on the left edge, the path starting at row $i$ will end at column $w_i$. This function only returns reduced pipe dreams (i.e. pipe dreams for which each pair of pipes crosses at most once).