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echo "input a1"
read a1
echo "input a2"
read a2
echo "input a3"
read a3
if [ "$a1" = '' -a "$a2" = '' -a "$a3" = '' ]
then
echo "abc"
fi
if [ "$a1" != '' -a "$a2" != '' -a "$a3" != '' ]
then
echo "456"
fi