MF

Hello all, I am new in BPMN just started learning.
I am confused in basic things.. or I have some basic questions.
Q1: why we should avoid OR gates in BPMN? (in some books they referred we should avoid OR gates)
any reference or any example.
Q2: where XOR split is useful than OR Split and where XOR join is useful than OR Join and vice versa.
any explanation with example. which i can easily understand.
Please help me out.

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