Format 1 (SUBTRACT)
*--------------* *-------------------*
V + V +
->->--SUBTRACT-*-identifier-1-*FROM-identifier-2*-------*-->
*-literal-1----* *ROUNDED*
->--*------------------------------------------*---------->
*-*----*-SIZE ERROR imperative-statement-1-*
*-ON-*
->--*-----------------------------------------------*----->
*-NOT--*----*-SIZE ERROR imperative-statement-2-*
*-ON-*
->--*--------------*--------------------------------------><-
*-END-SUBTRACT-*
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