In this paper we give a complete classification of the infinite Schreier graphs of an automaton group generated by an extended version of the binary adding machine.

R units (RVUs) were developed in 1988 as a method of accounting for physicians’ work effort and hospital or clinic expenses. Because RVUs provided a uniform, formulaic metric for myriad clinical services, they quickly became the prevailing method for setting feefor-service payments for Medicare and private insurance. However, the dominance of the fee-forservice model has created strong structur...