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You're definitely better off learning the long way, but here's a shorty...tee file.a.b.{A,B,C,D}.r < file.a.b.c-d.rOr, same thing but slightly longer and easier to understand:
cat file.a.b.c-d.r |...

'man ksh' yields the following:

${parameter%word}
Remove Smallest Suffix Pattern. The word will be
expanded to produce a pattern. The parameter expansion
...