if ( it is equal ) {
   do something;
}
elsif ( it is equal or close ) {
   do something else;
}

##</code><code>##

if ( it is equal ) {
   do something;
}

if ( it is equal or close ) {
   do something else;
}

##</code><code>##

if ( it is equal or close ) {
   if ( it is equal ) {
      do something;
   }

   do something else;
}