Examples:
was
completely
unregretful
about
what
had
happened
unregretful (English)
├── regretful (English)
│ ├── -ful (English)
│ └── regret (English)
│ └── regretten (Middle English (1100-1500))
│ └── regreter (Old French (842-ca. 1400))
└── 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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