The best replacement for doubles is floats.

The best alternatives to doubles are rated as following:
★★★★★  floats
★★★★★  classic
★★★★  classic p90x
★★★  singles tennis
★★★  singles badminton
★★  singles
★★  singles pokemon
★★  side mount

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Speaking about doubles, one probably shouldn't forget about printf.

Other search terms related to doubles and their ratings are:
★★★★★ printf
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Google Trends

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doubles
floats
classic