[word=as] [word=where] [lemma=there] □
[word=as] [word=where] [lemma=there] [□]
[word=as] [word=where] [lemma=there] □+
Not seldom will convenience itself require a deviation , as where there is some curvilinear sweep of low ground along which a principal avenue will most naturally trace itself , covering some principal sewer of drainage .