If given "helloworld" you wan't to avoid the suggestion "hello world" than the option you are looking for is "sug-split-char". This list option needs to be cleared using "clear-sug-split-char" This option can be specified on the command line with "--clear-sug-split-char", or added to an Aspell config file (see manual) or added to the language data file "nl.dat".
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