ASL fingerspelled C is normally a curved handshape, E is an angular/hooked/bent handshape. Under some circumstances, the normally curved C handshape might become more angular (perhaps when fingerspelling E-C-E fast) or the E handshape might relax into a more curved handshape (perhaps L-E-O might produce this). ((I’m inventing these examples just to make the point here – they may be wrong).
I would think that you might want to continue writing the C with a more curved handshape and the E with a more angular representation even if they looked identical on the surface.
Is this what you mean, Stefan?
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