<｜begin▁of▁sentence｜>### Instruction:
Given a Matrix class that supports the __getitem__ method as described, how can you extract the first row, a specific element at row 0 and column 1, and create a submatrix consisting of the first two rows, from an instance of a Matrix containing numerical data arranged in a 3x3 format?
### Response:
from Matrix import Matrix

# Create a new Matrix instance
matrix = Matrix([[1, 2, 3], [4, 5, 6], [7, 8, 9]])

# Get the first row of the matrix
first_row = matrix[0]
print(f'First row: {first_row}')

# Get the element in the first row and second column
element = matrix[0, 1]
print(f'Element at [0, 1]: {element}')

# Get a submatrix consisting of the first two rows
submatrix = matrix[0:2]
print(f'Submatrix from first two rows: {submatrix}')
<|EOT|>
