Al, Ben and Chuck, the Davis triplets, are out for a walk. As always, they're wearing identical outfits. The only way to tell them apart is by talking to them: Al always tells the truth, Ben sometimes tells the truth, and Chuck always lies.
As they pass you walking single-file, you ask who's who today.
Triplet in front: "The triplet in the middle is Al."
Middle triplet: "I'm Ben."
Triplet in back: "The triplet in the middle is Chuck."
From front to back, what is their order?