unhelpful (English)
├── -ful (English)
├── help (English)
│ ├── helpan (Old English (ca. 450-1100))
│ └── helpen (Middle English (1100-1500))
└── un- (English)
├── on- (Middle English (1100-1500))
│ ├── on- (Old English (ca. 450-1100))
│ └── ond- (Old English (ca. 450-1100))
├── un- (Middle English (1100-1500))
│ └── un- (Old English (ca. 450-1100))
└── unus (Latin)
└── oinos (Latin)
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