Healthy person accompanying sick person

person to person call

person-to-person

person-to-person call

person-to-person payment system

person-to-person service

persontoperson communication

persontoperson communication method

Person consulting on behalf of another person

(superscript *)P-connected component

1-Hamilton connected graph

2-connected

2-connected graph

2-connected graphs

2-connected k-dominating set

2-connected maps

2D serial-connected numbering

2-edge-connected

2-vertex connected