You are probably using Sage with Python 2. In Python 2, a list expression
involving an index variable `a` like
assume([U_asm[a] for a in [0, 1, 3]])
overwrites the previous content of the variable `a`. At the end of the
loop, `a` will have the value `3`, which leads to the output you obtained.
If you rename the loop index to something other than a,b,c,d, the problem
goes away.
With Python 3, this problem does not exist either, as loop variables are
local as one would expect. Therefore, I suggest to switch to using Sage
with Python 3.
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