if ($SomeTest)
   {# Brief opening comment to describe this block
   ...
   }
elsif ($AnotherTest)
   {# Brief comment for this block
   ...
   }
else
   {# Ditto
   ...
   }
...

##</code><code>##

if ($SomeTest)
   {# Brief opening comment to describe this block
      ...
   }
elsif ($AnotherTest)
   {# Brief comment for this block
      ...
   }
else
   {# Ditto
      ...
   }
...

##</code><code>##

if ($SomeTest) {
   # Brief opening comment to describe this block
   ...
}
elsif ($AnotherTest) {
   # Brief comment for this block
   ...
} else {
   # Ditto
   ...
}
...