S01: MODERATE
S02: EASY
S03: EASY
S04: EASY
S05: MODERATE
S06: EASY
S07: MODERATE
S08: MODERATE
S09: HARD
S10: HARD
S11: EASY
S12: HARD
S13: MODERATE
S14: MODERATE
S15: EASY
S16: HARD
S17: HARD
S18: MODERATE
S19: MODERATE
S20: HARD
S21: EASY
S22: EASY
S23: MODERATE
S24: MODERATE
S25: HARD
