It seems like you're describing a musical notation system or a practice method for playing a piece of music. In traditional sheet music, the following elements typically convey that information:
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Notes: The number of notes to play at once is indicated by the number of note symbols stacked vertically (chords).
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Duration: The length each note should be held is indicated by the shape of the note (whole notes, half notes, quarter notes, etc.) and sometimes additional markings like dots or ties.
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Dynamics: Instructions on how soft or loud to play are given through dynamic markings such as "p" for piano (soft), "f" for forte (loud), and various symbols like crescendos (to get louder) or decrescendos (to get softer).
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Harmony: The specific harmony to be played in the right hand can be indicated through chord symbols or notated directly on the staff.
If you have a specific piece of music or example in mind, I can help you interpret the notation or provide further details.