Ok, before u mentioned QP also..There is no rule in QP like that..
Btw, RasGas and Al Jazeera are not only the semi govt co's.. there are a lot..
Barwa
QD
QDVC
QP
Lusail
QASCO
QAFCO

even more..
All these co's doesnt have that rule though..

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http://www.youtube.com/watch?v=tjmNV6k9loU
rms..!!