list the launch site of the rockets whose one of the launch site has been cape canaveral air force station launch complex 6 ?
SELECT DISTINCT var_uri where brack_open var_x dbo_launchSite dbr_Cape_Canaveral_Air_Force_Station_Launch_Complex_6 sep_dot var_x dbo_launchSite var_uri sep_dot var_x a dbo_Rocket brack_close