jakh_graph.kql

let jakh = "Just another Kusto hacker";
let base = range skip from 0 to strlen(jakh) step 1
| extend jakhString = jakh
| extend ['char'] = substring(jakh, skip, 1)
| project-away jakhString
| project ['char'], id = strcat(['char'], skip)
| serialize;
let nodes = base
    | where isnotempty( next(id));
base
| extend dest = next(id)
| where isnotempty(next(dest)) 
| project src = id, dest
| make-graph src --> dest with nodes on id
//run in KE and configure Layout = Grouped, Nodes - Labels = char, Density to the max