language: AWK (gawk) (gawk-3.1.6)
date: 312 days 8 hours ago
link:
visibility: public 
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/^@/ { last_line=$0; line_to_print=true }
/^[^@]/ { if ( line_to_print == true ) print last_line; print $0; line_to_print=false }
END { if ( line_to_print == true ) print last_line }