    (021)

Considered side by side like this, the differences between PM_1 and PM_2
appear to be  trivial and insignificant, lacking in every conceivable
practical consequence, as indeed would be the case if both statements
were properly understood.  One would like to say that both variants
belong to the same &quot;pragmatic equivalence class&quot; (PEC), where all of
the peculiarities of their individual expressions are absorbed into the
effective synonymy of a single operational principle.  Unfortunately,