Here are some of the pertinent rules (via ITA Matrix):
Category 2: Day/Time restrictions
OUTBOUND - PERMITTED SUN THROUGH THU.
INBOUND - PERMITTED MON THROUGH FRI
Category 6: Minimum stay requirements
TRAVEL FROM LAST STOPOVER MUST COMMENCE NO EARLIER THAN 5 DAYS AFTER DEPARTURE FROM FARE ORIGIN.
Category 7: Maximum stay requirements
TRAVEL FROM LAST STOPOVER MUST COMMENCE NO LATER THAN 1 MONTH AFTER DEPARTURE FROM FARE ORIGIN.
Category 8: Stopover restrictions
NO STOPOVERS PERMITTED.
Category 11: Blackout Dates
OUTBOUND -
TRAVEL IS NOT PERMITTED 27JUL 19 THROUGH 11AUG 19 FOR
DEPARTURE FROM FARE ORIGIN.
INBOUND -
TRAVEL IS NOT PERMITTED 21DEC 19 THROUGH 31DEC 19 FOR
DEPARTURE OF FIRST INTERNATIONAL SECTOR.
Category 14: Travel restrictions
VALID FOR TRAVEL COMMENCING ON/AFTER 01JAN 19 AND ON/ BEFORE 31DEC 19.
Category 15: Sales restrictions
TICKETS MUST BE ISSUED ON/AFTER 27DEC 18 AND ON/BEFORE 04JAN 19.
Category 16: Penalties
CANCELLATIONS
ANY TIME
CHARGE USD 815.00.
CHARGE USD 2015.00 FOR NO-SHOW.
CHANGES
ANY TIME
CHARGE USD 415.00.
CHARGE USD 1015.00 FOR NO-SHOW.