Admittedly this is squeezing two questions into one, but they're both directly about Markush Group claim construction. From all I've read, the structure of this type always uses "selected from the group consisting of (A, B, and C or A, B, or C)" and it is always "consisting of" not "comprising." (In fact that last part is explicitly stated in MPEP 2173.05(h) Alternative Limitations [R-11.2013] - I.MARKUSH GROUPS.)

Question, part 1: I have assumed it's just as acceptable to list the components in an ordered list form such as a), b), c), as to list them linearly in a statement. True? It seems so, from MPEP's statement "a list of alternatively useable species regardless of format."

Question, part 2: I have read (from someone who asserts he's used it repeatedly with success) that using "and combinations thereof" as the last component of the Markush Group is the best solution to eliminating any uncertainty about "A, B, C with mutual exclusion" vs. "A, B, C individually OR in any combination." True?

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