Advent Of Code - Day 25

I basically bailed out at Day 14 but had a go at Day 25 for past few days - Obviously there shouldn't be an Advent of Code day 25 but never mind :slight_smile:

It's quite an interesting puzzle (if you are into a bit of maths)

Part 1 only - I'm finished now

Note - my first go managed to work for test input but not for puzzle input but eventually I worked out what I'd missed off

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