Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
### Context:
CREATE TABLE table_18795125_6 (replaced_by VARCHAR, outgoing_manager VARCHAR)
### Question:
How many categories for, replaced by, exist when the outgoing manager is Alan Buckley? 
### Answer:
SELECT COUNT(replaced_by) FROM table_18795125_6 WHERE outgoing_manager = "Alan Buckley"