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among the qualities listed on the human relations scale, the most important one for building new relationships Is

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Neuron
The most important quality when building a new relationship with someone are trust and empathy.

Without empathy or trust, we cannot advance a new relationship as every deepened relationship we have with other people are based on mutual trust and based on the mutual idea of helping each other if the other is in need. 
jaylanique
the most important one is communication and the others are simple or well should be simple if you know exactly what that relationship is asking for.

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