Potential answers for "Diplomat's sine qua non"

⭐⭐⭐⭐ TACT
⭐⭐⭐ NECESSITY
⭐⭐⭐ ESSENTIAL
⭐⭐⭐ NEED
⭐⭐⭐ SINE
⭐⭐⭐ QUA
⭐⭐⭐ NON
⭐⭐⭐ NEEDS
⭐⭐⭐ RING

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