when relating to buy-sell, understanding sell makes me think of target, which allows buy to make sense of source.
when relating to evidence, understanding statistical makes me think of testimonial, which allows analogical to make sense of anecdotal.

Sell stimulates source but references target.
Statistical stimulates anecdotal but references testimonial.

when relating to q1n, understanding q1r makes me think of q1o, which allows q1e to make sense of q1s.
when relating to q1n, understanding q1r makes me think of q1o, which allows q1e to make sense of q1s.

q1r stimulates q1s but references q1o.
q1r stimulates q1s but references q1o.