Fuzzy_partition with fuzzy_trapezoid

I already made this question, but I was not subscribed and not
received any reply. I tried this:

install.packages("sets")

...

library(sets)
teste = fuzzy_partition(varnames = c('a', 'b'), FUN = fuzzy_trapezoid, corners = c(1,2,3,4), height = c(1,1), corners = c(5,6,7,8), height = c(1,1) )

But I got this error:

Error in FUN(i, ...) :
  formal argument "corners" represents multiples specified arguments

Is it possible to combine fuzzy_partition with fuzzy_trapezoid?

Att,

Arthur Rodrigues Stilben
Geoinform?tica - LENEP
(22) 2765-6555