I can't understand the string:
"so that no lamp in the garland lies on the ground though some of
them may touch the ground.
".

> I can't understand the string:
> "so that no lamp in the garland lies on the ground though some of
> them may touch the ground.
> ".

Touch means that lamp would not move lower even if we'll remove the ground.
Lies means it would fall if we do.