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workmanlike
workmanship
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working substance
work·ing sub·stance (plural work·ing sub·stanc·es)


noun 
Definition:
 
fluid operating engine by undergoing change: a substance, especially a fluid, that undergoes changes in form or degree that are used to operate something such as an engine
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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