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In the following arrangements of letters, how many 'G' are there which are followed by 'K' and preceded by N?
A K G L M N D N K G C S N G K T G K G N D Z P U N G K X G
We look for the group N G K. It occurs in "S N G K T" and in "U N G K X". No other G has N before it and K after it, so the count is 2.
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