Between1928and1933NeymanandEgonPearsonhadwrittenanumberofimportantpapersonhypothesistestingandthecollaborationwashighlyproductivewithpaperssuchasOntheproblemofthemostefficienttestsofstatisticalhypotheses(1933)andThetestingofstatisticalhypothesesinrelationtoprobabilitiesapriori(1933).

Please segment the words:
Between 1928 and 1933 Neyman and Egon Pearson had written a number of important papers on hypothesis testing and the collaboration was highly productive with papers such as On the problem of the most efficient tests of statistical hypotheses (1933) and The testing of statistical hypotheses in relation to probabilities a priori (1933).