parse_map.js

`0 7→ 20, 1 7→ 13, 2 7→ 21, 3 7→ 0, 4 7→ 1, 5 7→ 2, 6 7→ 3, 7 7→ 4, 8 7→ 5,
9 7→ 6, 10 7→ 7, 11 7→ 8, 12 7→ 9, 13 7→ 10, 14 7→ 11, 15 7→ 12, 16 7→ 14,
17 7→ 15, 18 7→ 16, 19 7→ 17, 20 7→ 18, 21 7→ 19, 22 7→ 22,
23 7→ 23, 24 7→ 24, 25 7→ 25`.split(',')
.map(v => 
  v.replace('7→','')
    .trim()
    .split('  '))
.map(v=>({[v[1]]:v[0]}))
.reduce((v, acc) => Object.assign(acc,v),{});