Lists

• List — Items of one kind in a fixed order, one row each: bodies, fields, numbers, points, curves, limits, anything.
• List Element — Picks a single item out of a list by its position.
• Insert — Splices the items of one list into another at a chosen position.
• Remove — The list with a run of consecutive items taken out; the rest keep their order.
• Sub List — A run of consecutive items taken from a list.