Find the final 2-letters element of the following list:
AQ AR AT BA BA BA BO CA CY EQ FE FO GO GY HA HO JU KA MO RO RU SA SH SK SP SU TA TA TE TR VO WE ??
The 33 elements can be classified into $3$ categories:
- XY $>1$
Category 1:BA2 BA3 FO HA RU VO
- XY $\tilde \ge ~1$
Category 2:AQ AR AT BA1 BA CA CY EQ FE GY JU RO SA SH TA TE TR
- XY $=1$
Category 3:BO GO KA MO SK SP SU TA WE ??
$\tilde \ge 1$ means it is partially equal to $1$ and partially greater than $1$.
In response to Ak19's comment, these are not state nor country codes
This list will probably have to be updated in 5 years from now (2019).