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parallel --versionorman parallelshould list it somewhere)GNU parallel 20141022PARALLELset in your environment. Check withecho $PARALLEL. Try preceding your command withPARALLEL=, as inPARALLEL= parallel python3 ...all on one line.PARALLELis set and precedingPARALLEL=leads to the same error message. Can I somehow reinstallparallel? Does it even make sense?