Many TM extensions possible that don't affect computing power. Examine extensions, and see why they are equivalent to basic TMs. When designing TM algorithms, it is often useful to use these. Also, will be a way to introduce other TM programming techniques. Multi-track Especially useful for marking symbols.
Symbols are really just tuples.
With initial input endmarkers Endmarkers are often useful, but doesn't really matter if they are already provided for us. Change first cell to left endmarker. Shift all input right one. Change first blank to right endmarker. Move back left to end.