hereupon

from WordNet (r) 3.0 (2006)
hereupon
    adv 1: immediately after this; "hereupon, the passengers
           stumbled aboard"
    
from The Collaborative International Dictionary of English v.0.48
Hereupon \Here`up*on"\, adv.
   On this; hereon.
   [1913 Webster]
    

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