Match 1: why do we yawn v1 v2 v3
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Match 1: yawn i stretched and yawned v1 v2 v3
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Match 1: scientists haven't figured out the precise mechanism behind contagious yawning but it seems to be related to empathy v2 v3
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Match 1: why do we yawn v2 v3
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Match 1: yawn i stretched and yawned v2 v3
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Match 1: scientists haven't figured out the precise mechanism behind contagious yawning but it seems to be related to empathy v1 v3
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Match 1: why do we yawn v1 v3
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Match 1: yawn i stretched and yawned v1 v3
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Match 1: scientists haven't figured out the precise mechanism behind contagious yawning but it seems to be related to empathy v3
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Match 1: why do we yawn v3
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