Keywords I/if and E/else



I <condition>
   ...





I <condition>
   ...
E
   ...



I <condition1>
   ...
E I <condition2>
   ...



I <condition1>
   ...
E I <condition2>
   ...
E
   ...

Two consecutive keywords 
E
/
else
and 
I
/
if
are treated especially, so there is no need for a separate/additional keyword like 
elif
in Python or 
elsif
in Ruby.

Also 
I
/
if
and 
E
/
else
can be used in expressions similarly to ternary operator 
?:
from C:
sign = I x < 0 {-1} E I x > 0 {1} E 0 // 11l

sign =  x < 0 ? -1  :  x > 0 ? 1 : 0  // C


I/if subkeywords



I.likely <condition>
   ...
is used as a sign to the compiler that condition in most of the cases will be true.

And similarly:
I.unlikely <condition>
   ...
is used as a sign to the compiler that condition in most of the cases will be false.

Note: at the present moment performance increase when using this subkeywords is negligible, so their usage is not recommended.