Potential answers for "In math class, they're empty"

⭐⭐⭐⭐ NULLSETS
⭐⭐⭐ NULL
⭐⭐⭐ NULLSET
⭐⭐⭐ RULERS
⭐⭐ QED
⭐⭐ TIMESTABLE
⭐⭐ TRIG
⭐⭐ CALC

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