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coal mainly consists of
coal gas mainly consists of
coal is made up of
what is coal composed of
what is the main component of coal
the main constituent of coal is
coal is made primarily of which element
the primary composition of coal is
what does coal contain
is coal composed of minerals
major components of coal
coal mainly consists of, coal gas mainly consists of, coal is made up of, what is coal composed of, what is the main component of coal, the main constituent of coal is, coal is made primarily of which element, the primary composition of coal is, what does coal contain, is coal composed of minerals, major components of coal
