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The job of those standing in the lines is to get the walkers to smile . Children , pregnant or breastfeeding women , seniors , those diagnosed with a serious disease or those scheduled for an operation are particularly susceptible to risk . " We also must be prepared for the onset of the monsoon season , which brings with it the threat of landslides and further inaccessibility to those who are most vulnerable . Its purpose is to promote the scientific study of society and to encourage fellowship among those engaged in such study .