Examples:
he
is
mainly
interested
in
butterflies
principally (English)
├── -ly (English)
│ ├── -lice (Old English (ca. 450-1100))
│ └── -ly (Middle English (1100-1500))
└── principal (English)
└── principalis (Latin)
├── -alis (Latin)
├── princeps (Latin)
└── principum (Latin)
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