# Lists, Matrix and String commands

## PUTI
Replace an item and increase index


## GETI
Extract an item and increase index


## OBJDECOMP
Explode an object into its components


## REPL
Replace elements in a composite


## POS
Find the position of an element in a composite


## NPOS
Find object in a composite, starting from index N


## POSREV
Find the position of an element, starting from the end


## NPOSREV
Find the position from the end, starting at index N


## Extract

Extract a group of elements from a composite


## SIZE
Number of elements in a composite


## RHEAD
Returns the last element from the composite


## RTAIL
Removes the last element from the composite

