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Therefore participants should bring a supervising challenge or issue with them to the workshop . In her work on ritual , Harrison clearly distinguishes between participants and spsectators , and Firth elaborates on the spectator role in Malay ritual . Point-like solutions ( eg , specific parameter values ) can lead to artificial conflicts between participants - even when they share the same design goals - that can be avoided when the range of possible solutions can be maintained . There will be a minimum of 15 participants and a maximum of 20 . Although 23 countries were represented , the number of participants was relatively small and allowed fruitful discussions in the working groups and between participants . " The DoJ / FBI Petition seeks to expand law enforcement surveillance capabilities to include conversations between participants in a conference call that are no longer using the equipment or facilities of the intercept subject . Senior Corps participants volunteer to provide community services that include becoming " foster grandparents " to needy children .