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2nd time played through, the LH notes are played with an octave below, EXCEPT for the repeated D's, and the RH is played as octaves.
...there seems to be no directions to indicate this change in the repeat.
The composer arranged seven of these pieces for 2 pianos, 4 hands--the arrangement of no.113 is filled out in a similar way. Have a look at the score on IMSLP if you are interested
I wonder which B & H edition you have?