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#!/bin/sh
redo-ifchange a

read a <a
read b <b
read c <c
read d <d

if [ $a -lt $b ]; then
  echo 'FAIL: a < b' >&2
else
  echo 'PASS: a > b' >&2
fi

if [ $a -lt $c ]; then
  echo 'FAIL: a < c' >&2
else
  echo 'PASS: a > c' >&2
fi

if [ $b -lt $d ]; then
  echo 'FAIL: b < d' >&2
else
  echo 'PASS: b > d' >&2
fi

if [ $c -lt $d ]; then
  echo 'FAIL: c < d' >&2
else
  echo 'PASS: c > d' >&2
fi