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every number procedure-list
= used for the observer, 
= used for turtles, 
= used for patches
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every number procedure-list
Executes procedure-list every number seconds. Can be used only inside of
a "forever button."
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if predicate procedure-list
If predicate evaluates to true, then execute procedure-list.
Example:
if xcor > 0 [setc blue]
(Turtles on the right half of the screen turn blue.)
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ifelse predicate proc-list1 proc-list2
If predicate evaluates to true, then execute proc-list1. If
predicate evaluates to false, then execute proc-list2.
Predicate may have different values for different objects, so some objects may
execute consequent-procedure while others execute alternate-procedure.
Example:
ifelse xcor > 0 [setpc blue] [setpc red]
(The left half of the screen turns red and the right half turns blue.)
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ifelse-report boolean ilist1 ilist2
If boolean is true, executes ilist1 and returns its value.
If boolean is false, executes ilsit2 and returns its value.
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output thing
Does a non-local exit from the current procedure and returns anything to the
caller.
You cannot call this from the command center.
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repeat number procedure-list
Executes procedure-list number times.
Example:
pd repeat 36 [fd 1 rt 10]
(Each turtle draws a circle.)
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stop
Exits immediately from the current procedure.
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wait number
Waits for number seconds.
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