Table:
text: Tokyo Yūshun
Step races
Step races
_Race_name Grade Racecourse Distance Priority_entry_rights_to_Derby
1 Satsuki Shō GI Nakayama Turf 2000m
2 Aoba Shō GII Tokyo Turf 2400m
3 Principal Stakes Open Tokyo Turf 2000m
4 Kyoto Shimbun Hai GII Kyoto Turf 2200m
5 NHK Mile Cup GI Tokyo Turf 1600m

Question: What is the grade that Turf 1600m has under Tokyo Yūshun?

Question: What is Tokyo Yūshun's priority entry right to the 4th-ranked derby?