「我於五受陰觀察非我、非我所,而非阿羅漢者,我於我慢、我欲、我使,未斷、未知、未離、未吐。」
The above is translated by a Ven. Anālayo as "‘I examine these five aggregates of clinging as not self and not belonging to the self, yet I am not an arahant, with the influxes being eradicated. I have not yet abandoned the ‘I am’ conceit, the desire [related to the notion] ‘I am’, and the underlying tendency towards ‘I am’, have not yet [fully] understood it, not yet become separated from it, not yet vomited it out.’”
If possible, I would like to know how 所 in 非我所 implies "and not belonging to the self"?