TBR GChem S7 Passage IV

[ajumobim]

Q23 Defintion of triple point
In the material, it says that the triple point is the temperature and pressure in which solid, gas, and liquid coexist simultaneously. I don't understand why the second triple point of Material T is actually a triple point since it is not intersecting with the gas phase, and I don't understand why the first triple point of Material C is actually a triple point since it is not intersecting with the liquid phase,

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[azor ahai]

as long as it interfaces with 3 different phases, it's a triple point.