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Add 2 matchsticks to form 10 triangles. The matchsticks may overlap and do not have to be flat on the surface.
There are 4 Small triangles:
ALK
BCM
OME
LOJ
There are 6 combined triangles
AJH
BDE
LEF
MJF
KOH
CDO
ALK
BCM
OME
LOJ
There are 6 combined triangles
AJH
BDE
LEF
MJF
KOH
CDO
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