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Most pollock are trawl-caught and are typically available year-round . The two rental units are seldomly available , but information about them ( including a visual tour ) is available here if you are curious . And linking multiple datasets , when successful , provides more comprehensive data than are commonly available from any single source . The learning activities involve hardware and software that are commonly available . " The Review cited Barry for providing " choices that are typically available only at larger universities " while giving its students " the benefit of personalized attention . Tk applications should operate identically whether they are embedded inside a Web page or not , and whether they are delivered over a network or are locally available . Knowledge of soil chemistry makes it possible to formulate fertilizers that supply readily available plant nutrients . It seems an easy task when network infrastructure and services to support this are locally available . Lastly , all of the packages run on platforms that are commonly available in educational settings .