Grouping zones by level range?

[Toxigen]

Depending on your class, level of twinkage, etc:

Warrens (5-20+) --> Permafrost (20-30) --> Paw/CT (30-40+) --> CoM (40-50) --> Karnor / Velk / Seb / HS / Hole / CoM Uppers (50-60)

Thats pretty much the ZEM xp superhighway....if you're twinked can prob throw some kedge in there too for upper 40s / low 50s but unlikely to find random groups in there.