this shows the weak point of the birfield, really cool.
https://mail.google.com/a/mines.sds...&th=12e5dee2b0b044ca&attid=0.6&disp=inline&zw
let me know if the link works
https://mail.google.com/a/mines.sds...&th=12e5dee2b0b044ca&attid=0.6&disp=inline&zw
let me know if the link works
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