SRL for [squandered]: But his chance to become deputy mayor under Mayor Abraham Beame , a plan boosted by Mr. Sutton , was [squandered] because of Mr. Dinkins 's failure -- still largely unexplained -- to file income tax returns for four years running .
ARG-1: his chance to become deputy mayor under Mayor Abraham Beame , a plan boosted by Mr. Sutton | ARG-M-CAU: because of Mr. Dinkins 's failure -- still largely unexplained -- to file income tax returns for four years running