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This SINDARIN script calculates the cross section of double-Higgs production via W-fusion at a high energy muon collider. The cross section is dependent on the Higgs trilinear self-coupling constant, which can be expressed as a ratio to the Standard Model value. In this example the constant is 1.2 times the Standard Model value. Advanced SINDARIN scripts can perform simple analysis and plot histograms. See the WHIZARD 2 manual for a much more detailed look at the capabilities of WHIZARD.