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_name_48 (open_source VARCHAR, editor VARCHAR, cost___us$__ VARCHAR, activity VARCHAR)
### Question:
Which source has a Cost free, and an Activity of some, and an Editor of markitup?
### Answer:
SELECT open_source FROM table_name_48 WHERE cost___us$__ = "free" AND activity = "some" AND editor = "markitup"