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They arrange
these into rows of seven balls, on a stone or some other convenient place,
making two rows of seven balls each.

Word:

flat

Question:

Why are the balls arranged into two rows of seven each?

Answer (optional):

The balls are arranged into two rows of seven each as part of the method for cleaning oneself after defecating when monks practice beneath a tree or on open ground, where there are no constructed toilets. This arrangement allows them to use each ball of soil individually for cleaning purposes by dissolving it with a little water to create a thin consistency like rice gruel.