what is the main common interests of the abd al-rahman bin ahmad al-zayla'i and moḥammad mahdī baḥr al-ʿulūm ?
SELECT DISTINCT var_uri where brack_open dbr_Abd_Al-Rahman_bin_Ahmad_al-Zayla'i dbp_mainInterests var_uri sep_dot dbr_Moḥammad_Mahdī_Baḥr_al-ʿUlūm dbp_mainInterests var_uri brack_close