residual - relating to or indicating a remainder; something left after other parts have been taken away, prolong - lengthen or extend in duration or space directly, mass - the quantity of matter that something contains, latter - the second of two or the second mentioned of two, efficient - being effective without wasting time or effort or expense; able to accomplish a purpose; functioning effectively, conductivity - transmit a form of energy such as heat or electricity, attribute - a quality or feature regarded as a characteristic or inherent part of someone or something, proficient - competent or skilled in doing or using something, integrate - combine one thing with another so that they become a whole, dismay - consternation and distress, typically that caused by something unexpected,

Unit 13

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