 We now turn to some of the analogies involved in what is a corresponding bit of deontic folk logic, following the exposition in McNamara 1996a,b. This is a minor elaboration of elements that can be found explicitly in von Wright 1951b and Prior 1955 [1962]. However, much of it has roots in medieval Islamic and late medieval European thought, where possible analogies between deontic modals and alethic modals were being explored and formal deontic schemes were  proposed.[9]