How can I create a calculated member in Analyzer using MDX for the following logic?

WHEN 'F' THEN 'FEMALE'
WHEN 'Female' THEN 'FEMALE'
WHEN 'M' THEN 'MALE'
WHEN 'Male' THEN 'MALE'
WHEN 'U' THEN UNDIFFERENTIATED'
WHEN 'UN' THEN UNDIFFERENTIATED'
WHEN 'Undifferentiated' THEN UNDIFFERENTIATED'
ELSE 'OTHER'
END