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For a while we thought electronic books would take over the industry , but we found out that people that do n't buy print books , wo n't buy them electronically either . 175.1 is applicable only to aircraft operators , so it will be necessary to rewrite and clarify its application to entities that are not direct air carriers , but perform air carrier functions , e.g ., indirect air carriers . Nonsymbiotic nitrogen - fixation occurs in the soil and is accomplished by bacteria and related organisms which do not require host plants . I did n't have stock options because I was a contractor .