Let A denote the set shown shaded in the following figure. Refer to the structuring elemen...

Let A denote the set shown shaded in the following figure. Refer to the structuring elements shown (the black dots denote the origin). Sketch the result of the following morphological operations:

(a) (A ⊖B4)⊕B2

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(b) (A ⊖B1)⊕B3

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(c) (A ⊕B1)⊕B3

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(d) (A ⊕B3)⊖B2