<｜begin▁of▁sentence｜>### Instruction:
Given a sequence of items 'item1', 'item2', 'item3', can you use UniqueIdGenerator from igraph to generate unique IDs for these items and then retrieve the values stored so far? The code should print the unique IDs generated in the order they were added.
### Response:
import igraph as ig

# Initialize UniqueIdGenerator
id_gen = ig.UniqueIdGenerator()

# Generate some unique IDs
id1 = id_gen['item1']
id2 = id_gen['item2']
id3 = id_gen['item3']

# Retrieve the values stored so far
values = id_gen.values

print('Unique IDs generated:', values)
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