Inspired by PSE Advent Calendar 2021 (Day 13): A Christmas Hokuro, I challenged myself to create a Christmas tree-shaped puzzle. Unfortunately I had to edit the shape a little bit because... reasons. Hope it still looks close enough.
Rule of LITSO:
Divide the grid into tetrominos so that two identical tetrominos never share an edge (but may touch diagonally).
The following is an example puzzle with its solution.
Now solve the following LITSO puzzle.
You can try this puzzle on Penpa.