operator: delete

    description:
        delete[char, k] ket
        delete, one of three edit distance operators
        see: https://en.wikipedia.org/wiki/Edit_distance

    examples:
        delete["k", 0] |kitten>
            |itten>
        
        insert["g", 6] insert["i", 4] delete["e", 4] insert["s", 0] delete["k", 0] |kitten>
            |sitting>
    
    see also:
        insert, substitute