in how many territories were the wars fought where 6 /47 caliber mark 16 gun were used ?
SELECT DISTINCT COUNT attr_open var_uri attr_close where brack_open dbr_6%22/47_caliber_Mark_16_gun dbo_usedInWar var_x sep_dot var_x dbo_territory var_uri sep_dot var_x a dbo_MilitaryConflict brack_close