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CTRL + b - Bold
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CTRL + u - Underline
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CTRL + i - Italic
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ALT h h n - Remove fill colour
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ALT h b n - Remove borders
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ALT h b t - Add borders thick
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ALT h o i - Autofit columns
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ALT h o a - Autofit rows
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ALT h b s - Add borders external
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ALT h b a - Add borders all
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CTRL + SHIFT + % - Format as percentage
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CTRL + SHIFT + F - Open format dialog box