1 Introduction The lot-type design problem LDP seeks for an optimal set of lot-types and a supply in terms of lots of such lot-types such that the resulting supply of sizes matches the branch- and size-dependent demand as closely as possible (see [1] for details). A lot-type is defined as a vector with a component for each size. This component specifies the number of pieces of that size in the lot. For example, for the sizes S, M, L, and XL, a lot of lot-type (1, 2, 3, 1) contains one item of size S, two of size M, three of size L, and one of size XL.
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