Assertion: sulfur dioxide | /r/CapableOf | present in the process
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Source sentences:
text: Since sulfur dioxide forms the required strong acid catalyst by reacting with formaldehyde and water in the process, sulfur dioxide as such need not be supplied to or present in the process over the entire duration of the crosslinking reaction, but its supply may be discontinued after the first minute or two or when an adequate supply of the needed catalyst has formed.