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How could you take care of them all the time ! .. I tried it with so many normal clam shells for several times but always failed :( .. I always tried to find two completely identical ones as a lucky charm, hehe ^^

?? you mean why they didnt get lost?.. I didnt take care of them all this time, vive versa! I left them... and they are sitting there, in a box... here, at my new flat and with new family, i've obtained new shells (for my baby) when we visited the local Oceanarium.

take a little !BEER as consolation, my friend