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## Custom Design - Disallowed combinations - Help

Hi All

I'm trying to devise a DOE design to evaluate the robustness of a specific manufacturing unit operation.  The design consists of two continuous input parameters with defined test ranges.  The issue is that two of the experimental combinations are impossible to achieve (Parameter #1 Low + Parameter #2 High, Parameter #1 High + Parameter #2 Low). As of now I can only get Custom Design to do "OR" but I need both combinations excluded.  Also need this as an RSM in order to define proven acceptable parameter ranges for the unit operation.  Thanks.