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We know that NPDA cannot multiply: {a r b s c t : r s = t} is not a CFL. Indeed they cannot even

We know that NPDA cannot multiply: {arbsct : r s = t} is not a CFL. Indeed they cannot even perform a weak type of multiplication: L = {arbsct : t r s} is not a CFL either. However, Petri nets can perform a weak multiplication: show an unrestricted T-type Petri net for L.

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