I am trying to follow the steps described here for using \usesymbols[was] and details described here - 

https://wiki.contextgarden.net/Symbols/was  

Looks like the file `symb-imp-was.mkiv` is missing from the path -

\tex\texmf-context\tex\context\base\mkiv 

Thank you for any tips or pointers.

best regards,

Ramkumar