diff --git a/src/free_groups.jl b/src/free_groups.jl
deleted file mode 100644
index feb8a7b..0000000
--- a/src/free_groups.jl
+++ /dev/null
@@ -1,22 +0,0 @@
-import Base: convert
-
-export FGSymbol, FGWord
-
-immutable FGSymbol <: GSymbol
-    gen::String
-    pow::Int
-end
-
-(==)(s::FGSymbol, t::FGSymbol) = s.gen == t.gen && s.pow == t.pow
-hash(s::FGSymbol, h::UInt) = hash(s.gen, hash(s.pow, hash(:FGSymbol, h)))
-
-IdSymbol(::Type{FGSymbol}) = FGSymbol("(id)", 0)
-FGSymbol(x::String) = FGSymbol(x,1)
-
-convert(::Type{FGSymbol}, x::String) = FGSymbol(x)
-change_pow(s::FGSymbol, n::Int) = (n==0 ? i=one(s) : FGSymbol(s.gen, n))
-inv(s::FGSymbol) = change_pow(s, -s.pow)
-
-typealias FGWord GWord{FGSymbol}
-
-FGWord(s::FGSymbol) = FGWord([s])