The best replacement for pl1 is pl2.

The best alternatives to pl1 are rated as following:
★★★★★  pl2
★★★  cobol
★★★  gf3
★★★  pm1
★★★  pl3
★★  e-p2
★  e-p1
★  e p1
★  e-pl2
★  nex-3
  e pl3
  e pl2

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No companions for pl1 have been suggested so far.
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Google Trends

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pl1
pl2
cobol