Brep edges

Could anyone tell me how to pick the outermost edge of this surface?
grasshopper is reading each hexagon as a single surface. i need to combine them and eliminate the internal lines

Capture2

Hello,

combine surfaces to a single brep, connect the brep edge component and retrieve all curves in “naked”-output. Use boundary surface to create a single trimmed surface.

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Or you can use “Region Union” component.

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