Evidence on or near the ramps suggests that the Incas may have used wet clay or gravel to reduce friction , which could have decreased the number of laborers needed to pull each stone.
(friction; could have decreased; the number of laborers) (laborers; needed; to pull each stone) (Evidence on or near the ramps; suggests; that the Incas may have used wet clay or gravel to reduce friction) Context(Evidence on or near the ramps suggests,List([0, 38))):(the Incas; may have used; wet clay or gravel; to reduce friction) Context(Evidence on or near the ramps suggests the Incas may have used,List([0, 67))):(the Incas; may have used wet clay or gravel to reduce; friction , which could have decreased the number of laborers)
Evidence on or near the ramps suggests,List([0, 38)) Evidence on or near the ramps suggests the Incas may have used,List([0, 67))
friction laborers Evidence on or near the ramps the Incas the Incas
could have decreased needed suggests may have used may have used wet clay or gravel to reduce
the number of laborers
to pull each stone
that the Incas may have used wet clay or gravel to reduce friction
wet clay or gravel to reduce friction
friction , which could have decreased the number of laborers