You can make 12 different shapes (counting flips) with 5 squares set orthogonally (not diagonally). These are called pentominos.
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9 shapes
With no repetition of shapes (symmetry) we have obtained 26 different combinations.
Pentominoes are 12 shapes made up of 5 squares !If you rotate or move them they do NOT count as a different pentominoe!
The answer depends on the 5 shapes. Unfortunately, you have not specified what they are and so the question cannot be answered. - which
5 squares. One 2 by 2 square and four 1 by 1 squares.