Muchas gracias Rusty. A great explanation, just what I was looking for.
I think where I was getting stuck was that I thought IDOs could only replace people. I have seen the decirle algo a alguien construction before and hence thought the le would usually accompany the personal a (because the IDO is 'someone'). But, I guess whatever the IDO is (person, thing, idea), then a le or les can be used to refer to it in certain types of sentence.
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