I suppose it's the language evolving, but it used to be, "Is there any rhyme or reason why ..."
"Is there a rhyme ... " makes no sense at all.
I love you, man. But you may be dating yourself with that post...
“First they came for the verbs, and I said nothing because verbing weirds language. Then they arrival for the nouns, and I speech nothing because I no verbs.”
The wiki is pretty close, could use some editing (which I'll do on a free day). But for the 3rd digit, which usually designates the disctrict there is a little different.
0 ~ Sergeant
1 ~ Corporal
2-8 ~ Designates District
Again, this is for most everything except the admin units (55##).