Assertion: metre relay | /r/HasProperty | introduced at the 2017 iaaf world relays
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Source sentences:
text: Mixed-gendered 4 × 400 metres relays were introduced at the 2017 IAAF World Relays, repeated at the 2018 Asian Games, and will be added to the 2019 World Championships in Athletics and 2020 Summer Olympics.
text: Mixed-gendered 4 × 400 metres relays were introduced at the 2017 IAAF World Relays, with the IAAF first recognizing a world record in that event at the 2019 World Athletics Championships.