Four people, two regular people go to work every day, which involves meeting and handing over. How to arrange shifts?

Four people go to work and two people go to work every day. Four-shift, three-shift, eight-hour working system or three-shift and two-hour working system can be adopted, that is, each shift 12 hours is divided into day shift and night shift, in which Party A works in the day shift 12 hours, and Party B works in the night shift 12 hours, and the third day is off.