A quasi-particle basis of states for highest-weight
modules in $\ZZ_k$ parafermionic conformal theories
is derived directly from the parafermionic algebra. It
is formulated in terms of an effective exclusion
principle constraining strings of
$k$ fundamental parafermionic modes. It results
in fermionic-sum representations of the
characters, which are exactly the Lepowsky-Primc expressions.
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