Probably a and b are fragments of the same quipu.
Groups: irregular
Colors: browns, blue
Color combinations: monochrome, speckled
Strings: main, pendants, secondary
Ply: all S
Diameter: main 5mm, pendants 1,8-2,5mm
Recto/verso (tying pendant to mainstring):fragmented main
Knots:1/1 endknots (like a single knot), 1/2 endknots (a single knot securing the pendant tied with only part of the pendant as active), 8, long knots (Z), single knots (Z)
Sammler: Gretzer, Wilhelm