One of the multiple providers of services is then selected by generating an access code corresponding to one of the service providers in accordance with {HEAD ~ a predetermined algorithm} which provides {TAIL ~ a desired distribution} of usage by the subscriber of a plurality of the service providers 
provides
One of the multiple providers of services is then selected by generating an access code corresponding to one of the service providers in accordance with { HEAD ~ a predetermined algorithm } which provides { TAIL ~ a desired distribution } of usage by the subscriber of a plurality of the service providers
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH