WHILE (var1,comp1,var2),op,(var3,comp2,var4)... [DO]
This is the loop While/Do:
the instructions between WHILE and ENDWHILE are repeated until the condition specified is True; the conditions are specified in the same manner as IF instruction. DO is a comment.
Terminate the While control block: control retun to WHILE statement and conditions are newly evaluated: if True, block is newly executed otherwise control pass to statement next to ENDWHILE. In a program (or subroutine) every While must be closed by an EndWhile.
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