Ahh, that certificate 
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is Polkadot using substrate core or substrate frame?
I see the Polkadot has 6 sessions per era and some other blockchains built using substrate can have 2-3 sessions per era. just trying to undertand the concept here with sessions and era thank you in advance!
Hey @Alko89, I believe you mentioned that when using Substrate Frame, we can customize the consensus algorithm, is this the case with more or less epochs/sessions within era that GRANPA determines?