48,49,44,50,55,43,51,25,24,52,47,31,53
City / Route	Dist.	CULLENS; ID: 12	DUNHAM SPORTS; ID: 21
CAMPBELL/DORAN
    BOX; ID: 48	70	 	x
    RT 1; ID: 49	160	x	x
CLITHERALL
    BOX; ID: 44	60	x	x
ELBOW LAKE
    RT 3; ID: 50	34	 	x
FOXHOME
    RT 2; ID: 55	62	x	x
    BOX; ID: 43	80	x	x
NASHUA
    RT 1; ID: 51	51	 	x
ROTHSAY
    RT 2; ID: 25	205	x	x
    RT 1; ID: 24	215	x	x
TINTAH/TENNY
    RT 1; ID: 52	55	 	x
VINING
    BOX; ID: 47	40	 	x
WENDELL
    CARRIER; ID: 31	90	x	x
    RT 1; ID: 53	89	x	x
Total Distribution	1211	961	1211

Array
(
    [0] => Array
        (
            [0] => 21
        )

    [1] => Array
        (
            [0] => 12
        )

    [2] => Array
        (
            [0] => 12
            [1] => 21
        )

)

Query: SELECT route_id FROM insert_route WHERE insert_id IN (21 ) AND route_id IN (48,49,44,50,55,43,51,25,24,52,47,31,53) GROUP BY route_id HAVING count( DISTINCT insert_id ) = 1

Combination 1

Inserts: 21

Routes:
24
25
31
43
44
47
48
49
50
51
52
53
55

Query: SELECT route_id FROM insert_route WHERE insert_id IN (12 ) AND route_id IN (48,49,44,50,55,43,51,25,24,52,47,31,53) GROUP BY route_id HAVING count( DISTINCT insert_id ) = 1

Combination 2

Inserts: 12

Routes:
24
25
31
43
44
49
53
55

Query: SELECT route_id FROM insert_route WHERE insert_id IN (12 ,21 ) AND route_id IN (48,49,44,50,55,43,51,25,24,52,47,31,53) GROUP BY route_id HAVING count( DISTINCT insert_id ) = 2

Combination 3

Inserts: 12 21

Routes:
24
25
31
43
44
49
53
55