Select a connected set of squares - the coral - so that it does not touch itself, not even diagonally. (It means that the coral can have no island inside itself.) Numbers outside the grid indicate the lengths of consecutive parts of the coral in the given row or column (similary as in the "Paint it black" puzzles). However, numbers belonging to the same row or column are in increasing order and not in the order they appear. No 2x2 area may be covered by the coral.