digraph {

        start [label="Wormhole Code\nMachine" style="dotted"]
        {rank=same; start S0A S0B}
        start -> S0A [style="invis"]
        S0A [label="S0A:\nunknown\ndisconnected"]
        S0A -> S0B [label="connected"]
        S0B -> S0A [label="lost"]
        S0B [label="S0B:\nunknown\nconnected"]
        S0A -> P0_got_code [label="set_code"]
        S0B -> P0_got_code [label="set_code"]
        P0_got_code [shape="box" label="B.got_code"]
        P0_got_code -> S5
        S5 [label="S5: known" color="green"]

        S0A -> P0_list_nameplates [label="input_code"]
        S0B -> P0_list_nameplates [label="input_code"]
        S2 [label="S2: typing\nnameplate"]

        S2 -> P0_list_nameplates [label="update_nameplates"]
        P0_list_nameplates [shape="box" label="L.refresh_nameplates"]
        P0_list_nameplates -> S2

        S2 -> P2_claim [label="claim_nameplate" color="orange" fontcolor="orange"]
        P2_claim [shape="box" label="N.set_nameplate"]
        P2_claim -> S3
        S3 [label="S3: typing\ncode\n(no wordlist)"]
        S3 -> P3_stash_wordlist [label="got_nameplates" color="orange"]
        P3_stash_wordlist [shape="box" label="stash\nwordlist" color="orange"]
        P3_stash_wordlist -> S4 [color="orange"]
        S3 -> P0_got_code [label="submit_words"]
        S4 [label="S4: typing\ncode\n(yes wordlist)" color="orange"]
        S4 -> P0_got_code [label="submit_words" color="orange" fontcolor="orange"]

        S0A -> S1A [label="allocate_code"]
        S1A [label="S1A:\nconnecting"]
        S1A -> P1_allocate [label="connected"]
        P1_allocate [shape="box" label="RC.tx_allocate"]
        P1_allocate -> S1B
        S1B [label="S1B:\nallocating"]
        S1B -> P1_generate [label="rx_allocated"]
        S1B -> S1A [label="lost"]
        P1_generate [shape="box" label="generate\nrandom code"]
        P1_generate -> P0_got_code

        S0B -> P1_allocate [label="allocate_code"]
        
}