heating (English)
├── -ing (English)
│ ├── -ing (Middle English (1100-1500))
│ │ └── -ing (Old English (ca. 450-1100))
│ └── -inge (Middle English (1100-1500))
└── heat (English)
├── hætan (Old English (ca. 450-1100))
└── hæte (Old English (ca. 450-1100))
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