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Easy As LITS: Lots of "S"s

Puzzling Asked on May 24, 2021

This is an Easy as LITS puzzle (LITS variation), where you shade cells to form tetrominoes

Rules taken from Grandmaster Puzzles:

  • Shade exactly four connected cells in each outlined region, to form an L, I, T, or S tetromino.
  • All shaded cells are connected with each other.
  • No 2×2 group of cells can be entirely shaded black.
  • When two tetrominoes in adjacent regions share an edge, they must not be of the same type (L, I, T, or S), regardless of rotations or reflections.
  • The letters outside the grid indicate the first tetromino encountered in the corresponding direction.

An example puzzle and its solution, taken from Grandmaster Puzzles (who in turn credit Chris Green):

example

Now, solve this puzzle:

the real puzzle

Note: if you want to solve this on the image, clickthrough to get the full size version

First answer with a fully-explained logical solution path gets the checkmark.

One Answer

First, a few regions can be assigned shapes:

Now, the break-in:

And now we can resolve most of the grid:

And with some connectivity arguments, the puzzle is solved:

Correct answer by Deusovi on May 24, 2021

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