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54 seconds LANG=en_US.UTF-8
33 seconds LANG=C sort -k2,2rn -k1,1
23 seconds LANG=C sort -k1,1 | sort -k2,2rn

#!/bin/sh
# https://www.perlmonks.org/?node_id=11148773
...
| sort -k1,1 | sort -k2,2rn

printf "total time: %d s\n" $SECONDS >&2