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Study involving the origins of rye and another crop
C?R?
Could be corn but why?

Study - Con
Origins of rye - R

Corn is another crop.

Thanks mamya. Why is con a study?

con 2 (kŏn)
tr.v. conned, con·ning, cons Archaic
1. To study, peruse, or examine carefully.
2. To learn or commit to memory.
[Middle English connen, to know, from Old English cunnan; see gnō- in Indo-European roots.]

Funny old language we have.

Thanks again. I learn something new every day!!