Usage examples for optional
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It was optional with me whether I should walk through one hundred and twenty miles of primeval and most impassable forest, or paddle over an equal number of miles of water. – Hudson Bay by R.M. Ballantyne
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The singer will be wise, however, to avail himself of the power of producing an optional tone with the mechanism of the lower register only on rare occasions. – The Mechanism of the Human Voice by Emil Behnke