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spec: Hadeler and Castillo-Chavez ( 1995 ) and Huang and Castillo-Chavez ( 2002 ) have shown that core group dynamics ( in non-structured and structured populations ) have important implications on disease transmission and control . The best reason to have a Social Security retirement system is that it can provide an income floor for old people . The British Wheel of YogaThe British Wheel of Yoga , a registered charity , is the largest yoga organisation in the country . The measures continue to be important , however , and remain in place for internal accountability in the Office of Management Operations Plan and performance plans for the managers and staff . The best web sites are written with this in mind . At most , they argue , we can organize and advocate for a more generous set of policies at the federal and state levels . by Alison Brown I have reluctantly decided not to renew [ my subscription ] since I no longer feel that the magazine contains very much archaeology . Having attained gradually , and without any sudden shock , the highest elevation of Christian truth , he starts from the summit and gently comes down again . An international not for profit organization focused on preserving the legacy of Joseph H. and Clara Pilates . The show was right in the middle of East Hastings in the sketchiest drug area in North America .