Write I if the groups of numbers is arranged in increasing order and D if it is arranged in decreasing order.

_____ 1. 23 478 23 481 23 485 23 490 23 495
_____ 2. 71 234 71 194 71 087 71 078 71 052
_____ 3. 19 781 19 811 19 925 19 967 19 997
_____ 4. 46 456 52 134 67 324 74 567 82 432
_____ 5. 54 987 54 781 54 609 54 435 54 319