This paper is a study of the bases introduced by Chari-Loktev for local Weylmodules of the current algebra associated to a special linear Lie algebra.Partition overlaid patterns, POPs for short---whose introduction is one of theaims of this paper---form convenient parametrizing sets of these bases. Theyplay a role analogous to that played by (Gelfand-Tsetlin) patterns in therepresentation theory of the special linear Lie algebra. The notion of a POP leads naturally to the notion of area of a pattern. Weobserve that there is a unique pattern of maximal area among all those with agiven bounding sequence and given weight. We give a combinatorial proof of thisand discuss its representation theoretic relevance. We then state a conjecture about the "stability", i.e., compatibility in thelong range, of Chari-Loktev bases with respect to inclusions of local Weylmodules. In order to state the conjecture, we establish a certain bijectionbetween colored partitions and POPs, which may be of interest in itself.
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