finback (English)
├── back (English)
│ └── bak (Middle English (1100-1500))
│ └── bæc (Old English (ca. 450-1100))
└── fin (English)
├── fin (Middle English (1100-1500))
│ ├── fin (Old French (842-ca. 1400))
│ └── finn (Old English (ca. 450-1100))
└── פֿינף (Yiddish)
└── fimf (Old High German (ca. 750-1050))
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