In quadratic probing, new items were inserted into the hash table when the table got 50% full. Rehash the items into the new hash table and after this, perform the insertions for the new items. Note, however, that moving an item might require clicking (see instructions) several positions in order to follow the collision mechanism.
In this exercise, the items will be moved around by clicking them (i.e., selecting them). The selected item is denoted by Current key. First, select the item to be rehashed and then the new position for it. Click also positions where collisions occur (the items won't be overridden, but the color is changed). After rehashing, insert (operation = add) a set of new keys into the new hash table. Again, clicking positions will do.