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b5477e2implement relation variable type safetyAgentM b605de7refactor RelationalError to be ADTAgentM 444ab48implement group and ungroup operators for Tutorial DAgentM 5dbb181use let instead of unnecessary case complicationAgentM f407100tighten up ghc warningsAgentM 332a4b4fix recursive context passing in TutD REPRAgentM 86998f1terminal relation displayAgentM c6898c3implement simple REPR for Tutorial D interpreterAgentM 7555bfbimplement rename for Tutorial DAgentM 49ed722working Tutorial D parserAgentM