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Aug 29 2021: Colby O'brien places 3rd at the Men Senior Cat 4-5 Race at the Joe Martin Stage Race - GC in a group sprint
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Aug 29 2021: Colby O'brien wins the Men Senior Cat 4-5 Race at the Joe Martin Stage Race - Crit in a group sprint
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Aug 28 2021: Colby O'brien places 3rd at the Men Senior Cat 4-5 Race at the Joe Martin Stage Race - RR in a group sprint
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Aug 28 2021: Colby O'brien places 5th at the Men Senior Cat 4-5 Race at the Joe Martin Stage Race - Amateur - TT in a group sprint