Nothing

```
s <-
function(M, N) {
options(warn = -1)
if ( messages(M) != 1 ) { return( messages(M) ) }
if ( messages(N) != 1 ) { return( messages(N) ) }
if ( (M[4]==1 & N[4]==0) | (M[4]==0 & N[4]==1) | (M[4]==0.5 & N[4]==0.5) )
{
a1 = M[1]-N[1]
a2 = M[2]+N[3]
a3 = M[3]+N[2]
a4 = M[4]
print( noquote( paste0("the result of subtraction is (core = ", a1, ", left spread = " , a2, ", right spread = " , a3, ")"
, if ( a4 == 0 ) { paste0(" LR" ) } else if ( a4 == 1 ) { paste0(" RL" ) } else { paste0(" L" ) } ) ) )
return( invisible( c(a1,a2,a3,a4) ) )
}
else
{
return( noquote( paste0("Subtraction has NOT a closed form of a LR fuzzy number" ) ) )
}
}
```

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