Clarify wording
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%% the book for querying the backend.
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%%
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%% Runners implement the {async, Folder} within Riak backends - returning an
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%% {async, Runner}, where the Runner() can be called as a function. The
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%% {async, Runner}. Runner is just a function that provides access to a
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%% snapshot of the database to allow for a particular query. The
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%% Runner may make the snapshot at the point it is called, or the snapshot can
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%% be generated and encapsulated within the function (known as snap_prefold).
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%%
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%% Runners which view only the Ledger (the Penciller view of the state) may
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%% have a CheckPresence option - which causes the function to perform a basic
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%% have a CheckPresence boolean - which causes the function to perform a basic
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%% check that the item is available in the Journal via the Inker as part of
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%% the fold. This may be useful for anti-entropy folds
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