md` ## demonstration use case
- Two users touch phones
- Id's are exchnaged and triggers permission to a query showing common conctacts
- triggers an action that allows import of contact book into dydra from each user
- relrusts of shared conctcs are presented
- shared conctacts are jgiven temperoal attributes (you knew when)
- conctcts graphs deleted but shared conctcs with person retained
- on next meeting chnage in common conctatcs comapred
`