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Operation between two lists. op is one of the operators below :
| + Addition | - Subtraction | 
| * Multiplication | / Division | 
| ^ Power | 
 | 
The boolean operators are :
| > Larger Than | < Smaller Than | 
| >= Larger or Equal | <= Smaller or Equal | 
| = Equal | <> Not Equal | 
list ( list op number )
list ( number op list )
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 # copies elements 1, 5, 9, 13, 17 of x into y
Y = X[1,20,4]
list list[vector]
Extract a selection of elements from a list. The vector supplied as the argument provides the set of indices to be used. For example:
# copies elements 2, 1, 3 from x to y 
i = |2,1,3|
y = x[i]
number ( any in list )
number ( any not in list )
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