how many groups have fought in wars where shura council of mujahideen in derna fought too ?
SELECT DISTINCT COUNT attr_open var_uri attr_close where brack_open dbr_Shura_Council_of_Mujahideen_in_Derna dbp_battles var_x sep_dot var_x dbp_combatant var_uri sep_dot var_x a dbo_MilitaryConflict brack_close