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printf 'a\t\tb\tc\n' | ( IFS=$(printf "\t") read a b c; echo ".$a. .$b. .$c." )
printf 'a\t\tb\tc\n' | ( IFS=$(printf " \t") read a b c; echo ".$a. .$b. .$c." )
printf 'a,,b,c\n' | ( IFS="," read a b c; echo ".$a. .$b. .$c." )
printf 'a,,b,c\n' | ( IFS=" ," read a b c; echo ".$a. .$b. .$c." )
printf 'a ,, c\n' | ( IFS=" ," read a b c; echo ".$a. .$b. .$c." )
printf 'a ,, c d\n' | ( IFS=" ," read a b c d; echo ".$a. .$b. .$c. .$d." )
printf ' a,,b,c,d , ,\n' | ( IFS=" ," read a b c; echo ".$a. .$b. .$c." )
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