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AutoCorrect fixes common typing and spelling mistakes as you type.
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Digital signals use binary values such as 0/1 or high/low — all of the above.
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All Caps displays the selection in capital letters as a font attribute (reversible), without permanently rewriting characters like Change Case does.
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Hyperlinks appear underlined and blue by default (until visited, when many themes turn them purple).
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A modem is often external or optional and is not a required part of the system unit itself.
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