Nothing
spa <- function(Y,X,C){
both <- suppressWarnings(ma(cbind(Y=Y,X=X,C=C),partition=list(c(1),c(2,3)))$A)
one <- suppressWarnings(ma(cbind(Y=Y,C=C),partition=list(c(1),c(2)))$A)
return (max(both-one,0))
}
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