My 34 keys layout
This are my principles for layout:
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I am using Callum style layout. Here you can read explanation by Callum himself and his reasoning for not using mod-tap: here 
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There should be only one way to type key. Key can be on different layer but it must maintain its physical location. 
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The less features are used the better. 
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trilayer is cool. 
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There is 🐍 key for no reason. 
As well I have added one shot layers compatible with Callum's one shot keys.
There is simple TMUX layer as well.