Question: How many books were illustrated each Christmas for eight years by the man who, along with Walter Crane and Kate Greenaway, was among the strongest contributors to the child's nursery motif for during the 19th century?
{'answer': 'Two', 'supporting_facts': [['Walter Crane', 0], ['Walter Crane', 1], ['Randolph Caldecott', 0], ['Randolph Caldecott', 5]]}