Leading Edge Devices
Are comprised of 4 Krueger flaps inboard of the engines and 6 slats outboard of the engines. The LE flaps are extended whenever the TE flaps are not up. The slats extend from 1 to 5 and fully extend when beyond 5. Slat numbers 1 & 6 (the outboard slats) move a few degrees less than slats 2 to 5 when at full extend, causing the leading edge to look slightly disjointed in this configuration, this is normal.
The NG's have an extra outboard slat on each wing giving 8 in total. They have the same sequencing as the classics.
One may educate the ignorance from the unknowing but stupid is forever. Boswell; ca: 1533