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-rw-r--r--gn3/computations/slink.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/gn3/computations/slink.py b/gn3/computations/slink.py
index 5953e6b..3d7a576 100644
--- a/gn3/computations/slink.py
+++ b/gn3/computations/slink.py
@@ -161,7 +161,7 @@ def slink(lists):
try:
size = len(lists)
listindexcopy = list(range(size))
- listscopy = [child[:] for child in lists]
+ listscopy = [list(child[:]) for child in lists]
init_size = size
candidate = []
while init_size > 2: