Your problem is with this line:
if words in ur.content.decode("utf-8"):
words
is a list and ur.content.decode("utf-8")
results in a string. As the error message says, the left hand side of an expression of the form:
<left-hand-side> in <string>
requires that <left-hand-side>
be a string, not a list. Here’s an expression that will do what you want to do:
if any(s in ur.content.decode("utf-8") for s in words):
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