How Many Pre-Christian Schools of Thought in Judaism?

Okay, so we had the Essenes, the Sadducee, the Pharisee, Alexandrian Jews, even
the Ethiopic Jews, so I am under the impression that historically, Judaism was not u-
nited, but had many schools of thought prior to Christianity and even during.

How many other Jewish sects were there? or is what I named above all?

I’ve read there were about 20 different Judaisms in the ancient world.

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