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Regional Coded Snake (91)

Instruction:
Apply Snake rules. Additionally, a thickly outlined region must have the number of snake cells indicated in the top left cell of the region. Some numbers have been substituted by letters, both outside the grid, and in regions. All instances of the same letter must become the same number and different letters must become different numbers. Black cells are not part of the snake.

Reference: WPC 2017 (11)

Parent puzzle:
Snake
Related puzzles:
Regional snake