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-rw-r--r--src/symmetry.h6
1 files changed, 6 insertions, 0 deletions
diff --git a/src/symmetry.h b/src/symmetry.h
index ebe123c9..52dd387d 100644
--- a/src/symmetry.h
+++ b/src/symmetry.h
@@ -29,5 +29,11 @@ extern void get_equiv(signed int h, signed int k, signed int l,
signed int *he, signed int *ke, signed int *le,
const char *sym, int idx);
+extern int num_twins(signed int h, signed int k, signed int l, const char *sym);
+
+extern void get_twins(signed int h, signed int k, signed int l,
+ signed int *hp, signed int *kp, signed int *lp,
+ const char *sym, int idx);
+
#endif /* SYMMETRY_H */