Port is a type of Opening. Opening is a type of Space. Space is related to Board. 
Admission is related to Hospital. you are likely to find Wheelchair in/at/on Hospital. Wheelchair is a type of Seat. Seat is related to General. 
Port --IsA--> Opening --IsA--> Space <--RelatedTo--> Board 
Admission <--RelatedTo--> Hospital <--AtLocation-- Wheelchair --IsA--> Seat <--RelatedTo--> General 