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_88 (stroke_count INTEGER, radical__variants_ VARCHAR, frequency VARCHAR)
### Question:
WHAT IS THE STROKE COUNT WITH RADICAL 皿 FREQUENCY SMALLER THAN 129?
### Answer:
SELECT AVG(stroke_count) FROM table_name_88 WHERE radical__variants_ = "皿" AND frequency < 129