When writing ranges of numbers, most style guides agree on the use of an en dash (although the AP style guide prefers a hyphen). Do not use an em dash.
Use en dash for number ranges and no space either side
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- Feb 2024
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www.debbie-emmitt.com www.debbie-emmitt.com
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- Jul 2021
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www.chicagomanualofstyle.org www.chicagomanualofstyle.org