This is a model I designed and folded back in 2016. It is made from the same kind of units as
Single-Module Modular Heart. Any number of units can be used since the model is a linear chain.
With a long enough string of units, the coil can be closed and its ends connected, forming a Heart-Shaped Torus. This also means that
a single heart can be considered a special case of this model.
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