4. Formally comparable roots
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1.kerh₁, 1.kerh₂, 1.kerh₃, 1.kert, 1.kreu̯h₁, 1.kreu̯h₂, 1.kreu̯h₃, 1.skel, 1.skend, 1.skep, 1.ker, 1.sker, 1.kers, 2.kerh₁, 2.kerh₂, 2.kerh₃, 2.kers, 2.kreu̯h₂, 2.kert, 2.skel, 2.skend, 2.skep, 2.ker, 2.sker, 3.kerh₁, 3.kerh₂, 3.kerh₃, krei̯h₁, krei̯h₂, krei̯h₃, kreph₁, kreph₂, kreph₃, kar, kars, sken, kar, ker, kreh₁, kreh₁i̯, kreh₂, kret, kreu̯s, kreḱ, kremh₁, kremh₂, kremh₃, krend, kreph₁, kreph₂, kreph₃, kerd, kerḱ, krei̯p, sek, sekh₁, sekh₂, sekh₃, skabʰ, skebʰh₁, skebʰh₂, skebʰh₃, skedh₂, skeh₁t, skeh₂t, skeh₃t, skek, skelh₁, skelh₂, skelh₃, skelh₁, skeng, skenǵ, kerb, skerb, kerbʰ, skerbʰ, skerdʰ, kerp, skerp, kers, skers, kert, skert, skeu̯bʰ, skeu̯d, skeu̯h₁, skeu̯h₂, skeu̯t, kreb, skreb, skrei̯t, krengʷ, skrengʷ, krei̯, skrei̯, skeh₁tʰ, skrei̯bʰ, skeh₁tʰ, kremh₁, kremh₂, kremh₃
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