Stuck on 6.5, don't understand how to further split as needed. Tried skipping ahead to the 7s, but also don't understand the mechanic.
hints, if you want them (in rot13)
6.5: gur rkvg zvtug uryc
6.5, second hint: gur birenyy funcr qbrfa'g arrq gb or 3 gvyrf gnyy, vs vg pbaarpgf gb gur rkvg vg fgnlf nobir gur ibvq
7.1: gurer vf n jnl gb orpbzr gjb gvyrf ybat
7.1, second hint: lbh pna znxr n funcr gung yrgf lbh pbaarpg gb gur fvatyr oybpx