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SUBMIT YOUR IDEAI followed the solution proposed to figure out the extra credit assignment - this was a tough one, I admit, for me. I did learn new tips on using RegEx when parsing into 1-4 word pairs (nice use of RegEx!) thank you , @AYXAcademy !
This challenge was hell
I initially cheated by 'borrowing' the lookup table from the macro as I couldn't work out how to get the letters.
However, I then saw @Claje method of hammering through all possibilities of ASCII characters to the pairs and thought it was brilliant, so replicated that.