Tabulation of Kasser's Development and Decline
 Timeline for the Sahidic and Bohairic Dialects
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 Date CE    Sahidic           Bohairic
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  150       Preliminary       ...

  200       Pre-Classical     ...

  250       Classical         ...

  300       ...               Pre-Classical

  500       ...               Classical

  650       Final             ...

 1000       ...               Final

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 The source is Kasser's essay as reproduced in 
 Metzgers "Early Versions of the New Testament
 Their Origin, Transmission, and Limitations." 
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 Copyright (c)2006 by J. Warren Wells.