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√sas 'sleep'

present: [2.] s/asti etc.  sast/as  sas/ant etc.   -- [3.] sas/asti  s/asasti  sasat  

[perfect: sasAsa  asIzasat  asasIt  asAsIt  sasizyati  sasitA  sAsas-  sisasiza-  sAsaya-  ]

derivatives: sas/a?  

The single later occurence is doubtless artificial.