guðni th . jóhannesson and sigurður ingi jóhannsson are leaders of which place ?
SELECT DISTINCT var_uri where brack_open var_uri dbo_leader dbr_Guðni_Th._Jóhannesson sep_dot var_uri dbo_leader dbr_Sigurður_Ingi_Jóhannsson sep_dot var_uri a dbo_Place brack_close