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Stalagtites and stalagmites (747)

Instruction:
Place numbers from 1-6 in the grid so that each digit appears exactly once in each row and each column. The hints around the grid denote all the increasing or decreasing sequences longer than 2 in the given row/column in the correct order. The sequence is increasing from the tip of the sign.

Reference: WPC 2018 (120)

Child puzzles:
Cave Sudoku