Keymap

Layers

    w f p b      j l u y
→ a r s t g      m n e i o ⇚
  z x c d v      k h , . /
          ↲      ˽

    @ ⸬ ' ●      ● } ) ]             
→ ? \ : _ ●      ● { ( [ " ⇚ 
  ● % | & ●      ● # $ ~ /          
          ↲      ˽ □

Coding: Brackets, ; : and ' " (string/char).
LaTeX: \.
Enter often follows open brackets.
Left top row hard to press due to left thumb hold, put brackets which txt editor mostly auto-completes and rare £.
Bigrams ; + enter and open bracket + enter
H sounds like HashTag
Do not want a space to follow any of these charachters as right thumb must move.

    4 5 6 ●      ● ^ > <
→ . 1 2 3 ●      ● = ; - ' ⇚      
  ● 7 8 9 ●      ● + ! * /
        □        ˽ 0

Numpad style numbers with most common numbers on home row.
Home row MODS GASC-CSAG + bilateral combinations via achordion.h on left hand only for ctrl + + etc. Note we need basic keycodes on right hand, this is why some non-numerics sneak in.
Put numbers with math symbols.
Space follows equals so use left thumb for this layer.
_ = are common keys.
0. and '1.` are the most common decimal point locations.
Trigram /** for comment blocks therfore, make /* an inward roll across layers.
Additional . for decimal point.
Reason that && and || as logical operators are more comon than bitwise math op and therfore symbols.
>< muscle memory + roll for brackets and avoid -> sfb.
Avoid SFB of kind ?=. Had to have one choices are <, >, +, ! decided + was least common.
Need ! for != bigram.
Underline (_) is under the line (-)!