NewChain returns a new Chain with prefixes of prefixLen words.

StateMonitor maintains a map that stores the state of the URLs being polled, and prints the current state every updateInterval nanoseconds.

Chain contains a map ("chain") of prefixes to a list of suffixes.

Resource represents an HTTP URL to be polled by this program.

State represents the last-known state of a URL.

Prefix is a Markov chain prefix of one or more words.