When a + b + c + d make cake, a, b, c, and d are ingredients that are edible. When a + b + c + d make a child happy, a, b, c, and d are possibly components of a birthday gift (gift+gift wrap+card+message on card) or event segments (visit at zoo+transport to and from+seeing a special animal+being with parent). When a + b + c + d make a home pleasant for living, a, b, c, and d are elements such as comfortable furniture, a meal at the table or kitchen counter while talking with a family member, music, and calmness in the air. When a + b + c + d make an outdoor game, a, b, c, and d can be team members, a ball or chalk, a play area, and sportsmanship.
When a + b + c + d make a person feel unwanted, a might be a sense of unkindness in the air, b and c might be participants who create that sense of unkindness, and d might be an out-of-style outfit or a physical handicap or a perceived problem that actually doesn’t exist.
Each ingredient contributes and each ingredient matters. The outcome simply reflects the quality of the parcel and parts that connect for each measure of living.