Ternary.opUnary

Ternary opUnary(string s)() if (s == "~")

Truth table for logical operations,

`a`	`b`	`~a`	`a \| b`	`a & b`	`a ^ b`
`no`	`no`	`yes`	`no`	`no`	`no`
`no`	`yes`		`yes`	`no`	`yes`
`no`	`unknown`		`unknown`	`no`	`unknown`
`yes`	`no`	`no`	`yes`	`no`	`yes`
`yes`	`yes`		`yes`	`yes`	`no`
`yes`	`unknown`		`yes`	`unknown`	`unknown`
`unknown`	`no`	`unknown`	`unknown`	`no`	`unknown`
`unknown`	`yes`		`yes`	`unknown`	`unknown`
`unknown`	`unknown`		`unknown`	`unknown`	`unknown`