_____________________________________________________________
butfirst, bf list
= used for the observer, 
= used for turtles, 
= used for patches
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butfirst, bf list
Reports the value of list with its first element removed.
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butlast, bl list
Reports the value of list with its last element removed.
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empty? list
Reports true if list is the empty list; false otherwise.
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first list
Reports the first element of list.
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fput item list
(first put)
Reports the value of list with item inserted as its first element.
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item item-number list
Reports item item-number of list. Note that numbering of list items starts at 0, not 1.
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last list
Reports the last item of list.
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length list
Reports the length of list.
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list item1 item2
Reports a new list with item1 as its first element, item2 as its second element.
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list? thing
Reports true if thing is a list; false otherwise.
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lput item list
(last put)
Reports the value of list with item inserted as its last element.
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member? item list
Reports true if item is an element of list; false otherwise.
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position item list
Reports the first position of item in the list; if item is not in
the list, reports false.
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sentence, se list1 list2
Reports a new list composed of elements of list1 and the elements of list2.
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