Case 1: There are 2 pairs of twin primes between 1 and 10.

Case 2: There are 0 pairs of twin primes between 90 and 100.

Case 3: There are 8 pairs of twin primes between 1 and 100.

Case 4: There are 35 pairs of twin primes between 1 and 1000.

Case 5: There are 205 pairs of twin primes between 1 and 10000.

Case 6: There are 1224 pairs of twin primes between 1 and 100000.

Case 7: There are 8169 pairs of twin primes between 1 and 1000000.

Case 8: There are 2 pairs of twin primes between 11 and 19.

Case 9: There are 0 pairs of twin primes between 12 and 18.

Case 10: There are 1 pairs of twin primes between 11 and 18.

Case 11: There are 1 pairs of twin primes between 12 and 19.