Spoiler!
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Heavy :
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I haven't figured out the proper format. I'm just stuck.
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Spoiler!
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There is an easter egg too. 

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Help - must have tried over 20 different variations of addresses- what am I doing wrong ?
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It's incredibly easy to overthink this puzzle. Below are some graded hints leading to the solution. It assumes you know keys 75 and 78. If you don’t know them, then don’t continue. . .
Spoiler!
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Loving the Easter egg!