Removed special char in section 4
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@ -19,7 +19,7 @@ Similar transformations appear in optimizing compilers --- the above equivalence
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\subsection{Generalizing Singletons}
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Singletons allow users to try out hypotheticals, explore cleaning solutions, and conduct small-scale tests.
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It is often easier for users to perform one-off curation steps initially, repairing errors in the data as singletons, rather than expending the mental effort to generalize the repair upfront.
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It is often easier for users to perform one-off curation steps initially, repairing errors in the data as singletons, rather than expending the mental effort to generalize the repair upfront.
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However, when the user needs to adapt their preliminary data cleaning solution to new data, to a larger dataset, or to an updated dataset, these singleton operations can become a burden.
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Although they put more control over the curation process in the user's hands, singleton actions increase the size and complexity of a \langname script, with no benefits beyond the initial dataset.
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In addition to considering readability-enhancing rewrites that preserve semantic equivalence, it will be necessary for \sysname to evaluate how singleton actions can be generalized --- effectively a form of query (or curation, in this case) by example~\cite{Zloof:1975:QE:1499949.1500034}. Concretely, given a set of similar statements with singleton targets, we would like to propose to the user a set of rewrite that applies the same update to a region covering all the singletons.
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