SELECT
    a,
    b,
    c,
    d
FROM t1
WHERE (((a = 1) AND (b = 2)) AND ((c = 3) AND (d = 4) AND (a = 5))) OR ((a = c) AND (b = 10) AND (1000 = d)) OR (((a = c) AND (b = 10)) AND (1000 = d))