Twist-hinged dissection of two pentagons plus two pentagrams to a decagon

two pentagons plus two pentagrams to a decagon (8)

Flipe-hinged pieces

Reference :

Updates to Chapter 22 of  Hinged dissections : Swinging & twisting, by Frederickson, Greg N.

http://www.cs.purdue.edu/homes/gnf/book2/Booknews2/ch22.html#THH

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