===========================================
====== Stack Used in MTN Block ============
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( From James COOK et al.)
=========================

IF,ELSE,ELSIF
=============
UNTIL,WHILE
===========
DO
==  #L5S1
 Stacks : 4  To Next adress et type de fin;
          5  Exit from adress
FOR
=== #L4S1
 Stacks : 4  To Next adress et type de fin;
          5  Exit from adress
          9  Bypass test from entry