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The negation of ~ svv(~ r^^s) is equ...

The negation of `~ svv(~ r^^s)` is equivalent to : (1) `s^^~ r` (2) `s^^(r^^~ s)` (3) `svv(rvv~ s)` (4) `s^^r`

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`~(-s vv (~ r ^^ s))`
`~(~s) ^^ ~ ( ~ r ^^ s)`
`s ^^ ( ~ (~r) vv ~ s)`
`s ^^ ( r vv ~ s)`
`( s ^^ r) vv ( s ^^ ~ s) `
`s ^^ r vv f`
`s ^^ r`
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