context function 3: add-learn


add-learn:
    description:
        add-learn(sp, sp, seq)
        wrapper around an add-learn rule

    examples:
        -- implements: friend |Fred> +=> |Sam>
        -- implements: friend |Fred> +=> |Emma>
        add-learn(|op: friend>, |Fred>, |Sam>)
        add-learn(|op: friend>, |Fred>, |Emma>)

    see also:
         learn, seq-learn, apply
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