Ekstrak sub bagian dari matriks

>>> import numpy

>>> a = numpy.array([[1,2,3],[2,2,2],[5,5,5]])
>>> a
array([[1, 2, 3],
       [2, 2, 2],
       [5, 5, 5]])

>>> a[0:2,0:2]
array([[1, 2],
       [2, 2]])
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