( Coal ( ( is ( by ( ( far ( the ( major source ) ) ) ( of ( the electricity ) ) ) ) ) ; ) )
(ROOT (S (NP (NNP Coal)) (VP (VBZ is) (PP (IN by) (NP (NP (RB far) (DT the) (JJ major) (NN source)) (PP (IN of) (NP (DT the) (NN electricity)))))) (: ;)))
Coal is by far the major source of the electricity;
(ROOT (S (NP (NNP Coal)) (VP (VBZ is) (NP (NP (DT the) (NN source)) (PP (IN of) (NP (JJS most) (NN electricity))))) (. .)))