They call this nitpicking:-)

Modified the text of the .html a little bit. ist = is, places = place, imputs = inputs, rebuilt = rebuild, olaces = placed, orientated = are oriented

"placed TO the rails" or "placed TO the first rail" do not sound quite right to me, but may be OK.
alternatives might be "placed on the rails or "placed along the rails..."

Also the AAABBBCCC placement description was not clear to me.
A description of the ABCABCABC placement would also be helpful.
Or even just AABBCC placement?
A specific example, say 4 objects to place, and two rails...(?)

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The Sweep node has two options available by the RMB:

• One Rail
• Two Rails

One Rail:

Takes one Rail for each Sweep. The number of profiles used for each rail is defined by the whole number of profiles divided by the number of rails. The order in which the profiles are placed to the rail is defined by the switch in the infos panel. AAABBBCCC means the first, second, third, ... profile in the objectlist is placed to the first rail.

Two Rails:

Takes pairs of curves from the rail inputs and places profiles from the profiles input to them. The order in which the profiles are placed to the rail is defined by the switch in the infos panel. AAABBBCCC means the first, second, third, ... profile in the objectlist is placed to the first rail pair.