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# $FreeBSD: releng/12.1/bin/sh/tests/expansion/cmdsubst18.0 314637 2017-03-03 22:46:20Z jilles $
x=X
unset n
r=${x+$(echo a)}${x-$(echo b)}${n+$(echo c)}${n-$(echo d)}$(echo e)
[ "$r" = aXde ]
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