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The best laid plans , however , do not take account of Indian holidays or Indian efficiency . Some builders are retired professional contractors , builders , or carpenters , but most come from other walks of life : retired farmers , police officers , sales people , doctors , teachers , mechanics , pastors , etc. Those with experience help those with less experience . While the publisher of Web of Science works very hard to clean up author and journal title data in the database , they are n't able to be as careful with the cited references , since they're already abbreviated , and may come with errors already built in by the authors . We had remained quiet for about five minutes , when some dark object was descried ahead , moving on the surface of the sea . Electronically activated valves , powered by ST devices will soon replace traditional mechanical versions .