if( state equals A) { Take action1 }
   elsif( state equals B) { Take action2 }
   else                   { Take action3 }

##</code><code>##

    unless( state equals A ) { Take action1 }
elsunless( state equals B ) { Take action2 }
else                        { Take action3 }

##</code><code>##

   unless( state equals A) { Take action1 }
   elsif ( state equals A) { Take action2 }
   else                    { Take action3 }


##</code><code>##

   unless( state equals A) { Take action1 }
   else                    { Take action2 }