Thanks for your explanation too. You basically confirm it is a kind of
convention to have numbers or other codes fixedly assigned to specific
TV channels in order for people to be able to refer to the channels
using these numbers or codes as appropriate. I don't think this is the
situation in the Czech Republic where people almost exclusively refer to
TV channels by their brand names and numbering convention probably never
goes beyond a household as it's bound to be different house to house...
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