Does anyone have any SPSS syntax to decompose a 4-way interaction from a mixed ANOVA with 2 repeated factors?

Right now, we have a significant 4-way interaction that needs decomposition. Rather than conducting a series of ever-shrinking ANOVAs to decompose it, I was wondering if anyone had a something available to test that, e.g., MMATRIX, LMATRIX.

Don't worry, we're sufficiently powered.

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