42196180 mates make up the pairs; of these this question have what means?

34851751 reads; of these:
  34851751 (100.00%) were paired; of these:
    28104042 (80.64%) aligned concordantly 0 times
    6097947 (17.50%) aligned concordantly exactly 1 time
    649762 (1.86%) aligned concordantly >1 times
    ----
    28104042 pairs aligned concordantly 0 times; of these:
      612899 (2.18%) aligned discordantly 1 time
    ----
    27491143 pairs aligned 0 times concordantly or discordantly; of these:
      54982286 mates make up the pairs; of these:
        52538050 (95.55%) aligned 0 times
        2280319 (4.15%) aligned exactly 1 time
        163917 (0.30%) aligned >1 times
24.63% overall alignment rate