three piece puzzle by tails

'.(.)\1(.)\2.'
[[ $1$2$3$1$2$1$3$2$1 =~ $_ ]]&&echo $BASH_REMATCH
read a&&. * $a

Note that non-ascii characters in the above source code will be escaped (such as \x9f).

To protect the system from spam, please input your favorite sport (hint: I believe its name must start with 'g', case insensitive)

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