Slide projector lens assembly order

I bought a used Cabin 35mm slide projector made by Sunlit, circa mid
1960s. The front projector lens assembly was disassembled and in a
plastic bag. The lens assembly consists of one 1 " diameter biconvex
lens (almost planoconvex), one 1.25" diameter planoconvex lens, one 1"
diameter symmetrical biconcave lens, 1/4" long metal spacer, 1/4" long
beveled metal spacer and front threaded retainer ring. On the lens
retainer ring is written "P-Accurar", "f=75mm" and "1:2.5".
In what order should these components be assembled?

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