Tags give the ability to mark specific points in history as being important
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debian/0.7.4-342648c2a · ·foonathan-memory release 0.7.4-3 for unstable (sid) (maintainer view tag generated by dgit --quilt=gbp) [dgit distro=debian split --quilt=gbp] 
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debian/0.7.4-2b4c78fdb · ·foonathan-memory release 0.7.4-2 for unstable (sid) (maintainer view tag generated by dgit --quilt=gbp) [dgit distro=debian split --quilt=gbp] 
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debian/0.7.4-110bb433b · ·foonathan-memory release 0.7.4-1 for experimental (rc-buggy) (maintainer view tag generated by dgit --quilt=gbp) [dgit distro=debian split --quilt=gbp]