Applescript : Fusionar lista

Estoy tratando de fusionar dos listas pero siempre tengo un error

set myNewList to ""

set myClipboard to the clipboard
set theList to words of myClipboard
##set theLength to (get length of mylist)

set ColortheList to {"42f489", "5cdf64", "FFFF00", "41f4d0", "4191f4", "4286f4", "4286f4", "f44192", "f44192", "f44192", "42f989", "5cdf54", "FFFF40", "41f4d5", "4191f2", "4386f5", "4246f4", "f55192", "f46192", "f24192"}

repeat with a from 1 to length of theList
    copy ({item a of theList, item a of ColortheList}) to the end of the |myNewList|

end repeat

Volver :

error "Can't set end of \"\" to {\"whateverfirstitemis\", \"42f489\"}." number -10006 desde el último punto de inserción de ""

¿Cómo puedo crear una nueva lista con los elementos de mis portapapeles fusionados con la lista de colores?