how many non-fiction subject are there of the books whose one of the non-fiction subject is the church of jesus christ of latter-day saints ?
SELECT DISTINCT COUNT attr_open var_uri attr_close where brack_open var_x dbo_nonFictionSubject dbr_The_Church_of_Jesus_Christ_of_Latter-day_Saints sep_dot var_x dbo_nonFictionSubject var_uri brack_close