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...del can be estimated if I load formula.tools?I need to restart R each time. Here is a simple reproducible example: *library(gmm)data(Finance)r <- Finance[1:300, 1:10]rm <- Finance[1:300, "rm"]rf <- Finance[1:300, "rf"]z <- as.matrix(r-rf)zm <- rm-rfres <- gmm(z ~ zm, x = ~ zm)summary(res)# Now the model cannot be estimated is formula.tools is loadedlibrary(formula.tools)res <- gmm(z ~ zm, x = ~ zm) # invalid term in model formula# Even if I detach detach("package:formula.tools", unload = TRUE)res <- gmm(z ~ zm, x = ~ zm) # inva...