The best replacement for 12a is 13b.

The best alternatives to 12a are rated as following:
★★★★★  13b
★★★  12
★★★  134a
★★  22a
★★  88a
★  pg-13
★  pg 13

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Speaking about 12a, one probably shouldn't forget about 134a.

Other search terms related to 12a and their ratings are:
★★★★★ 134a
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12a
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