Rather, when treated as two singlecharacter words, they can make sense in a sentence such as "请 (please) 自 (self) 来 (come) 取 (take)".
when using single-beam search to process "自来水 (tap water)", the two-character word candidate "自来" is likely to have been thrown off the agenda before the third character "水" is considered, leading to an unrecoverable segmentation error.