dm "(x2)" "(x1)" < $1 | regress
dm "(x2)" "(x1)" "(x1^2)" < $1 | regress
dm "(x2)" "(x1)" "(x1^2)" "(x1^3)" < $1 | regress
dm "(x2)" "log(x1)" < $1 | regress
dm "(x2)" "log(x1)" "(x1)" < $1 | regress
dm "(x2)" "log(x1)" "(x1)" "(x1^2)" < $1 | regress
dm "(x2)" "log(x1)" "(1/x1)" < $1 | regress
dm "(x2)" "log(x1)" "(1/x1)" "(1/(x1^2))" < $1 | regress
dm "(x2)" "log(x1)" "(1/x1)" "(x1)" < $1 | regress
dm "(x2)" "log(x1)" "(1/x1)" "(x1^.5)" < $1 | regress
dm "(x2)" "log(x1)" "(1/x1)" "(x1)" "(x1^2)" "(x1^.5)" "(1/(x1^2))" < $1 | regress