I think as a general rule, people of the fourth trine are drawn to those of the third trine, the third to the second, the second to the first, and the first to the fourth. Or put it more accurately, people are more drawn to those whose birthdays are **about** one year or five years or nine years, or one year or five years or nine years plus twelve multiplied by any number, earlier than their own birthdays, or those whose birthdays are three years or seven years or eleven years, or three years or seven years or eleven years plus twelve multiplied by any number, later than their own birthdays.
**about** means **not exactly, can be six months more or less**.
Keep in mind though, Chinese astrological signs’ appeal to each other does not decide who will marry who or who will stay married with who. Marriages are decided more by economic and social factors than by the compatibility of personalities.