[support] Show/hide block on selected pages

[Marolijo - Pol maresma]

Hello I need to show/hide a block on selected pages, I know about php code
to control block visibility, and I know the Block Assign module, but: 

I need to show block A on selected pages and views.
I need to show block B on selected pages and views.
I need to show block C on the rest.

I'm not shure what is the best approach to do that without a very big
IF/THEN/ELSE on php.

Thank's for all!

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