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Integers | i: 0 _ _ | Index Of Last

`i: y` is the list of integers from`-y` to`y` ;`` in general,`i: a j. b` produces the list of numbers from`-a` to`a` in`b` equal steps (or in`1+2*a` steps if`b` is`0`). Thus:
       i: 3
    _3 _2 _1 0 1 2 3

       i: _2
    2 1 0 _1 _2

       i: _2.5j4
    2.5 1.25 0 _1.25 _2.5

       i: 0
    0
|  | `i:` is like`i.` but gives the index of the last occurrence. Thus:
       1 2 3 4 1 2 3 i: 1 2 2 3 3 3 4 4 5
    4 5 5 6 6 6 3 3 7

       1 2 3 4 1 2 3 i. 1 2 2 3 3 3 4 4 5
    0 1 1 2 2 2 3 3 7

For example:

       (3 # i.3 4) i: (i.2 4)
    2 5

       (3 # i.3 4) i. (i.2 4)
    0 3

       (] #~ i.@# = i.~) 'eleemosynary'     first occurrence of each letter
    elmosynar

       (] #~ i.@# = i:~) 'eleemosynary'     last  occurrence of each letter
    lemosnary

       (] #~ i.~ = i:~) 'eleemosynary'      letters that are unique
    lmosnar

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