Modified parser.scm to include Common-1, Common-2, A3; modified py-primitives.scm to include A-4
added comments to all problems through ex 6
merging after part 1
merge part one  Comm[#1,2], A[#3], B[#3], A[#4], A[#5], tested - merge seems to work, added transcript_person_a.txt to master, still needs confirmation from person A.
merge comm[#1,2],A[#3,4,5],B[#3]

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