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why is coal valuable
why is coal valuable to south africa
why is coal useful
why is coal good to use
how is coal important
what is the importance of coal
what is the benefit of coal
what is good about coal
what is the advantages of coal
what are coal advantages
good thing about coal
why is coal valuable, why is coal valuable to south africa, why is coal useful, why is coal good to use, how is coal important, what is the importance of coal, what is the benefit of coal, what is good about coal, what is the advantages of coal, what are coal advantages, good thing about coal
