There are four workers in the problem who must be defined as unary resources, since each worker can only perform one activity at a time. In addition, we must define an alternative resource set and assign our two interchangeable workers to the set.
As in Example 5 in Adding Transition Times, we must define a function for building the different houses. However, our search must be modified to include a process for choosing which of the alternative resources to use for each activity requiring one of the alternative resources.
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