Calculate the perimeter of the following figures:

(1) $18 a$
(2) $11 b$
(1) $10 a$
(2) $44 b$
(1) $20 a$
(2) $22 b$
none

(1)

18 a

(2)

11 b

none

(1)

10 a

(2)

44 b

(1)

20 a

(2)

22 b

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(2) $11 b$
(1) $10 a$
(2) $44 b$
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(2) $22 b$
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