1. 751.
    0
    tttttttttt ii tttttttttt rrrrrrrr aa tttttttttt oooo rrrrrrrr
    tt ii tt rr rr aa tt oo oo rr rr
    tt ii tt rrrrrr aa aa tt oo oo rrrrrr
    tt ii tt rr rr aaaaaa tt oo oo rr rr
    tttttt ii tttttt rr rrrr aa aaaa tttttt oooo rr rrrr
    ···
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