[pol_throw_away]

I took this statement:

'The caretaker tells you each, individually, that together you can see either 18 or 20 statues. '

as being:

    size(see_A) + size(see_B) = 18 or 20

as opposed to:

    size(see_A union see_B) = 18 or 20

i would have assumed they would add the word distinct if they wanted to not double count overlapping statues.