+assert(aPart.size("Bodies") == 8), "Right number of construction: {}".format(aPart.size("Bodies"))
+assert(aPart.size("Construction") == 7), "Right number of construction: {}".format(aPart.size("Construction"))
+assert(aPart.size("Groups") == 2), "Right number of construction: {}".format(aPart.size("Groups"))
+assert(aPart.size("Folders") == 4), "Wrong number of folders: {}".format(aPart.size("Folders"))