I can't resist this one



 From Sen
Hi,
  Given a list, say xx: [2,1,3,3,5], how would I use 'sublist' to
  extract the indices where '3' occurs?

   I know I can write a routine checking whether each element xx[i] = 3
   or not and print out the indices 'i'.

   What I want to know is how to implement a predicate in 'sublist'
   which will work.


  I can't resist to this one, this is really funny, the best of the day.

  Happy day.


 Also:  Read the documentation of sublist, if gives the values of element of the
list, so how can you extract any number that is not on the list?.

 Consider l:=[fun,fun,morefun]

 what values of this list are equal to the position of fun?
 
 Also: there is a list function position

:lisp (position 3 '[1 2 3 4 5 6 3 3 3])

Again, sorry but i can resist to this one,too funny for me.