Mahble's Geography Challenge #4

Solve the code. When you have, comment the explanation below.
Inspired by Wolfcam, rg1227, and FlabberBapper
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Congratulations to Scambigol for being the first to solve this one!
Quiz by mahble
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Last updated: November 23, 2017
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First submittedNovember 22, 2017
Times taken6
Average score100.0%
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Country
Code
Brazil
SIL
Kenya
NOKU
Malaysia
KOAH
New Zealand
AER
Netherlands
Correct!
+1
Level 76
Nov 23, 2017
first letter seems to be the initial of the largest city
+1
Level 77
Nov 23, 2017
That's right - how about the rest?
+1
Level 76
Nov 23, 2017
ah - 2nd letter of 2nd largest, 3rd of 3rd largest?
+1
Level 77
Nov 23, 2017
That's correct! Good job!
+1
Level 65
Nov 23, 2017
It should AOE because the name of the city is The Hague not just Hague.
+1
Level 77
Nov 23, 2017
There, AOE works now.
+1
Level 77
Dec 19, 2017
I mean technically you could say R, because it's s'Gravenhage...