key1_set1 - key1_set2
key1_set1 - key2_set2
key2_set1 - key1_set2
key2_set1 - key2_set2
key1_set1 - key1_set3
key1_set1 - key2_set3
key2_set1 - key1_set3
key2_set1 - key2_set3
key1_set1 - key1_set4
key1_set1 - key2_set4
key1_set1 - key3_set4
key2_set1 - key1_set4
key2_set1 - key2_set4
key2_set1 - key3_set4
key1_set2 - key1_set3
key1_set2 - key2_set3
key2_set2 - key1_set3
key2_set2 - key2_set3
key1_set2 - key1_set4
key1_set2 - key2_set4
key1_set2 - key3_set4
key2_set2 - key1_set4
key2_set2 - key2_set4
key2_set2 - key3_set4
key1_set3 - key1_set4
key1_set3 - key2_set4
key1_set3 - key3_set4
key2_set3 - key1_set4
key2_set3 - key2_set4
key2_set3 - key3_set4