4. Formally comparable roots
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1.bʰer, 1.bʰerdʰ, 1.bʰerǵʰ, 1.bʰrem, 1.bʰres, 1.bʰreh₁u̯, 1.bʰreu̯, 1.bʰreu̯h₁, 1.bʰreu̯h₂, 1.bʰreu̯h₃, 1.bʰreu̯s, 2.bʰerdʰ, 2.bʰerh₁, 2.bʰerh₂, 2.bʰerh₃, 2.bʰerǵʰ, 2.bʰerm, 2.bʰrem, 2.bʰres, 2.bʰreu̯, 2.bʰreu̯h₁, 2.bʰreu̯h₂, 2.bʰreu̯h₃, 2.bʰreu̯s, 3.bʰer, 4.bʰer, 5.bʰer, 6.bʰer, 6.bʰerh₁, 6.bʰerh₂, 6.bʰerh₃, bʰrenḱ, bʰreḱ, bʰardʰ, bʰarsdʰ, bʰerg, bʰergʰ, bʰerh₁ǵ, bʰerh₂ǵ, bʰerh₃ǵ, bʰerh₁ḱ, bʰerh₂ḱ, bʰerh₃ḱ, bʰerh₂, bʰers, bʰeru̯, bʰerǵ, bʰerǵʰ, bʰrag, bʰredʰ, bʰreh₁, bʰreh₁ǵ, bʰrei̯h, bʰrei̯h₁, bʰrei̯h₂, bʰrei̯h₃, bʰrei̯h₁k, bʰrei̯h₂k, bʰrei̯h₃k, bʰrei̯ǵ, bʰrekʷ, bʰremh₁, bʰremh₂, bʰremh₃, bʰrenk, bʰreu̯h₁g, bʰreu̯h₁ǵ, bʰreu̯h₂g, bʰreu̯h₂ǵ, bʰreu̯h₃g, bʰreu̯h₃ǵ, bʰreu̯k, bʰreu̯ḱ, bʰreg, bʰreǵ
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