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BACA (Given Set) (994)
Instruction:
Blacken some cells and then place a single letter into every empty cell such that the letters in the given multiset appear in each row and each column. (If a letter appears many times in the multiset, it should appear exactly that number of times in each row and each column.) Some cells already contain a letter; these cells must either be left alone or blackened (which removes that letter from the cell). The letters outside the grid indicate the first letter that can be seen in the respective row or column from the respective direction. When numbers are given to the left of (or above) the main grid, they represent the lengths of all the contiguous blackened cell blocks in the corresponding row (or column). The lengths are given in order from left to right (or top to bottom), and cell blocks must contain at least one unblackened cell between them.