Airport Engineering
According to the International Civil Aviation Organization (I.C.A.O.), the runway lengths of aerodromes, have been coded by

Seven English alphabets
Last Seven English alphabets
First Seven English alphabets
First seven natural numbers

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Airport Engineering
The capacity of parallel runway pattern depends upon

Lateral spacing between two runways, weather conditions and navigational aids available.
Weather conditions and navigational aids available
Lateral spacing between two runways and weather conditions
Lateral spacing between two runways and navigational aids available

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