how many other home stadium are there of the soccer club whose home stadium is stade 20 août 1955 ?
SELECT DISTINCT COUNT attr_open var_uri attr_close where brack_open var_x dbo_homeStadium dbr_Stade_20_Août_1955_ attr_open Béchar attr_close sep_dot var_x dbo_homeStadium var_uri brack_close