list the 1978 arab league summit city is also the place of death of sharaf al-dīn al-ṭūsī ?
SELECT DISTINCT var_uri where brack_open dbr_1978_Arab_League_summit dbp_cities var_uri sep_dot dbr_Sharaf_al-Dīn_al-Ṭūsī dbo_deathPlace var_uri brack_close