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This suppression has been attributed to four factors , all related to the presence of beneficial organisms such as fungal-feeding nematodes , protozoa , and fungal-feeding bacteria . Although many co-op students complete their academic program in four years , some delay graduation for a year to obtain additional work experience . We have four computers , a local area network ( LAN ) , develop and maintain our own Web sites , implement numerous software applications and spend many hours reading our user 's manuals when operating the systems and peripherals . " Perhaps over the next four years , some who have already converted may go back to a corporate structure , " Toronto Dominion Bank chief economist Don Drummond said . And with the number of diagnosed cases in this country expected to quadruple in the next four years , some of us are going to die .