In this snippet of Sage code I believe that pos is [1,2,3]. But mod(1,p)
in pos evaluates to False, while mod(1,p) in [1,2,3] evaluates to True.
However 1%p in pos and 1%p in [1,2,3] both evaluate to True.
p=7
pos=[1..(p-1)/2]
pos==[1,2,3], mod(1,p) in pos, mod(1,p) in [1..3], 1%p in pos, 1%p in [1..3]
(True, False, True, True, True)
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