<｜begin▁of▁sentence｜>### Instruction:
Given you have a 2x2 matrix instantiated using a custom Matrix class, can you obtain a string representation of this matrix using the __str__ method?
### Response:
import Matrix

# Instantiate a matrix
mat = Matrix.Matrix([[1, 2], [3, 4]])

# Get a string representation of the matrix
str_mat = mat.__str__()
print(str_mat)
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