Wellllllllll, that would require two players, three if this question were to be answered for the whole piece. In fact we MUST be able to do both actually. If not then:
1) You need to play using different strings and/or position. I believe this point will become more clear when we begin playing in higher positions (farther down the neck.)
OR if you cannot
2) Somebody goofed the score
3) Your playing something not meant for (in our case anyway) solo guitar
I left out creative string tuning. Anyway, when I first saw this, it drove me crazy. The above diagram and beat summing process was the way I reconciled it in my head. Like I said, it's easier to play that piece than it is to analyze.
1989 Takamine C132S, Aquila 19C strings