( ( ( ( Increase ( ( the number ) ( of sprues ) ) ) and ) ( thoroughly ( heat ( the metal ) ) ) ) . )
(ROOT (S (VP (VP (VB Increase) (NP (NP (DT the) (NN number)) (PP (IN of) (NP (NNS sprues))))) (CC and) (VP (ADVP (RB thoroughly)) (VB heat) (NP (DT the) (NN metal)))) (. .)))
Increase the number of sprues and thoroughly heat the metal.
(ROOT (S (NP (NP (DT A) (-LRB- -LRB-) (NN n) (-RRB- -RRB-) (NN increase)) (PP (IN in) (NP (NN length)))) (VP (VBZ happens) (PP (TO to) (NP (NN metal) (NN railroad) (NNS tracks))) (PP (IN during) (NP (NP (DT the) (NN heat)) (PP (IN of) (NP (DT a) (NN summer) (NN day)))))) (. .)))