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  1. or download this
    ## prepare some SELECT statement
$sth->execute() || die "Error: " . $dbh->errstr;
if( $sth->rows > 0 ){
 ## do some stuff
}
  2. or download this
    ($_='kkvvttuubbooppuuiiffssqqffssmmiibbddllffss')
 =~y~b-v~a-z~s;                             print