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Future research should involve the prospective collection of data and the influence that specific HIV drugs , HIV factors ( such as viral load and CD4 + count ) , drug-induced unique factors , genetic factors and non-HIV modifiable risk factors have . In the heavy hitters problem , a vector of frequencies describes a large and changing collection of items and the goal is to track the most frequent items from the information in a small number of non-adaptive linear measurements ( dot products ) that are made to the frequency vector . The other organisation described here , the UK-based Boxmind - which has itself developed a subject gateway - has a business model based on licensing access to a collection of e-lectures and the software used to create them , and on selling related ' communication services ' to non-academic organisations . The Gujarati namkeens are probably the most fascinating : sweet and salty pava chevda , colourful mixtures , a bewildering collection of sevs and the delicious bhakarvadi .