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$i = 0
for( $j = 0; $j < 10 ; $j++ )
...
   }
   $i ^= 1 ;
}

$i = 1 ;
for( $j = 0; $j < 10 ; $j++ )
...
     $class = "even" ;
   }
}

if( $class =~ /even/ )
{
...
{
   $class = "even" ;
}

$class = ( $class ~= /even/ ) ? "odd" : "even" ;