====== LET var:multitype = EXP ======
Evaluate expression "EXP", convert and assign to "VAR"  

**NOTE:**  
LET is the only optional keyword.  If no keyword is found, LET is assumed.  There are certain circumstances where it may be required, such as assignment to a variable named the same as a statement. PRINT, for example, would require a line such as LET PRINT = TRUE instead of just PRINT = TRUE)