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Book 127-131 keys. 127. Top left-solid Rt and down –oil Rt and up is gas Rt and over is plasma. Book p 128. Book 128. Book p 129. Book p 129. Book p 129. Book p 129. Book p 129. Book p 130. Book p 131 optional. Book p 130. Book p 130. Book p 130. Book p 130. Book p 131.
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127 • Top left-solid • Rt and down –oil • Rt and up is gas • Rt and over is plasma