segmentation: unnecessary _ shit
rank.candidate: unneces sary _ shit unnecessary _ sh it un necessar y_s hit un necessar y_shit unnecessary _shi t unnec essary _ shit unne cessary _ shit unnecessary _sh it unnecessary _shit unnecessary _ shit un necessary _ shit unnecessary _ s hit unn ecessary _ shit un necessar y _ shit unneces sary_sh it un necessar y_sh it unneces sary_s hit unnecessary _ shi t unnecessary _s hit unnecessary _ s hi t