7 pairs without solutions

There are 7 pairs with out solutions, 2 double months and 5 double numbers:

• 22/30: 88 filtered positions
• 21/27: 104 filtered positions
• February/July: 107 filtered positions
• May/December: 122 filtered positions
• 24/30: 148 filtered positions 
• 22/24: 161 filtered positions
• 6/14: 170 filtered positions

Things to notice:

• There are no dates involved, so this is indeed A-puzzle-a-day. Well done DragonFjord!
• The average number of filtered positions of all 903 pair is 215. On the Statistics page we will have a closer look at this, more precisely to the correlation between number of solutions and number of filtered positions.
  The conclusion is that there is a weak negative correlation: the higher the number of solutions of a pair, the lower the number of filtered positions. And vice versa.
  That this correlation is weak, becomes clear from the above: the 7 pairs with lowest possible number of solutions, all have a number of filtered positions below the average of 215.