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commercial:vessel,
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marine:vessel,
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local:craft,
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sophisticated:vessel,
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noncombatant:vessel,
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naval:vessel,
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small:craft,
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small:vessel,
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specialized:vessel,
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small:watercraft,
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large:vessel,
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marine:craft,
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working:craft,
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larger:vessel,
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specialised:craft,
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special:equipment,
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maritime:equipment,
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small:ship,
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floating:equipment,
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traditional:boat,
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specialised:vessel,
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private:boat,
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motorized:craft,
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special:ship,
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auxiliary:vessel,
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specialized:ship,
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vital:equipment,
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animate:object,
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working:ship,
Category Nuances for tugboat:
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small,
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larger,
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motorized,
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marine,
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floating,
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naval,
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working,
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noncombatant,
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maritime,
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commercial,
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animate,
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local,
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sophisticated,
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traditional,
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specialised,
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private,
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special,
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large,
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auxiliary,
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specialized,
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vital,
Simple Categories for tugboat: