⍝ Pick of F of G of H ... arg:

    ⎕io←1

    1 of + of - of × of ÷ 10        ⍝ +10
10
    2 of + of - of × of ÷ 10        ⍝ -10
¯10
    3 of + of - of × of ÷ 10        ⍝ ×10
1
    4 of + of - of × of ÷ 10        ⍝ ÷10
0.1
    5 of + of - of × of ÷ 10        ⍝  10 (out of range index returns arg).
10

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