Please answer the questions below:

1. What problems may arise from the interaction of regional customary international law norms with universal customary international law norms?
2. How the duration of a custom can influence whether a custom qualifies as customary international law?
3. If a state hasn't given its explicit consent, is it still bound by the customary international law?
4. In general, Sharia law allows Qisas (death penalty) for the cases of adultery, murder, blasphemy and such others. What if the majority of other non-Muslim countries consistently practice the abolition of death penalty, should Muslim countries still be bound by the law of abolition of death penalty without their explicit consent?

Course name: Public international Law