How do you read this code ?

["Cyndi Bradberry" <CyndiB@xxxxxxxx>]

     C     TTBAST        IFNE      'D'
     C     TTA9CD        ANDNE     '001'
     C     TTA9CD        ORNE      '002'
     C     TTA9CD        ORNE      '003'
     C     TTA9CD        ORNE      '012'
     C     TTA9CD        ORNE      '013'
     C     TTBAST        ORNE      'H'
     C     TTA9CD        ANDNE     '   '
     C                   MOVE      TTOFCD               OFCD      2

We have run across  this code in a very old program we are trying to
bring into the current century.

If you were to rewrite this using parenthesis.....how would you group
things ?  We dragged out the manual on the order of resolving equations,
but it really doesn't help us much.

Thanks,
Cyndi B.
Boise Idaho