Rearrange the parts of the sentence in correct order.
Only a country not yet rid
P-of its colonial hangover
Q-and controls, labels dissent as seditious
R-of a government that commands

* The sentence starts with "Only a country not yet rid". The adjective "rid" takes the preposition "of", which points to either P or R.
Let's check links: "rid of its colonial hangover" (P) flows perfectly.

Next, "hangover and controls" doesn't form a complete sense before introducing the verb. Instead, look at the structure: "Only a country not yet rid of its colonial hangover (P), or of a government that commands (R) and controls, labels dissent as seditious (Q)."

Wait, let's verify the meaningful phrase link: "...not yet rid of its colonial hangover (P)... [or missing link] ...of a government that commands (R) and controls, labels dissent as seditious (Q)."

Actually, the sequence PRQ reads: "Only a country not yet rid of its colonial hangover (P) of a government that commands (R) and controls, labels dissent as seditious (Q)." This matches standard configuration where it means a country not yet rid of its colonial hangover, [possessive/characteristic] of a government that commands and controls...

Let's check RPQ: "Only a country not yet rid of a government that commands (R) of its colonial hangover (P)..." — this doesn't make grammatical sense.

Hence, PRQ is the correct configuration.