In this paper we discuss our research into … performed with equal ease in the reverse direction. … [p. 300] In our research we have used the … [instead of the history-logging approach] … [p. 300] We have implemented the forward movements: "step', … and "before". All … can be given a count argument … We have also implemented "until" and "buntil" movements …
Google-1
Google-2
Copyright clearance needed for quotation.