if cond1 then
   action1
elsif cond2 then
   action2
elsif cond3 then
   action3
else 
   action4
endif

##</code><code>##

if cond1 then
   action1
else
   if cond2 then
      action2
   else
      if cond3 then
         action3
      else
         action4
      endif
   endif
endif

##</code><code>##

[
   if => cond1, action1, [
      if => cond2, action2, [
         if => cond3, action3, action4
      ]
   ]
]