Group the following numbers

The phrases on the left describe numbers. We want to know which topics are similar to each other. Drag each item into one of the groups on the right. Put similar items into the same group. Each group can have any number of topics in it, from only a single topic to many of them.

Press when you are done.

 item 9
 item 15
 item 11
 item 12
 item 13
 item 20
 item 19
 item 18
 item 10
 item 7
 item 5
 item 17
 item 8
 item 3
 item 14
 item 4
 item 6
 item 2
 item 16
 item 1

Drag here to create a new group