what does coal take to form
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what does coal take to form
how long does it take for coal to form
how long does coal take to form
where did coal formation take place
how long does it take for coal to be formed
how long does it take coal to form diamond
where does coal formation take place
what does coal take to form, how long does it take for coal to form, how long does coal take to form, where did coal formation take place, how long does it take for coal to be formed, how long does it take coal to form diamond, where does coal formation take place