OOOEEPS, you are wrong AGAIN
There is NO WAY you can BE VERY SURE about this (argument 5 out of 10)

YOU better can make another choice

Question FOUR of four questions

I am VERY SURE
that the SOUND-BARRIER
is BROKEN
at sea-level by a man

***
I am NOT so SURE
that the SOUND-BARRIER
is BROKEN
at sea-level by a man



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