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printf '%s\n' 'a\ b c' | { read a b; printf '%s\n' "x${a}x${b}x"; }
printf '%s\n' 'a b\ c' | { read a b; printf '%s\n' "x${a}x${b}x"; }
printf '%s\n' 'a\:b:c' | { IFS=: read a b; printf '%s\n' "x${a}x${b}x"; }
printf '%s\n' 'a:b\:c' | { IFS=: read a b; printf '%s\n' "x${a}x${b}x"; }
printf '%s\n' '\ a' | { read a b; printf '%s\n' "x${a}x${b}x"; }
printf '%s\n' '\:a' | { IFS=: read a b; printf '%s\n' "x${a}x${b}x"; }
printf '%s\n' '\\' | { read a b; printf '%s\n' "x${a}x${b}x"; }
printf '%s\n' '\\\ a' | { read a b; printf '%s\n' "x${a}x${b}x"; }
printf '%s\n' '\\\ a' | { read -r a b; printf '%s\n' "x${a}x${b}x"; }
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