Wasthis one of the original exercises of Da Mo? Or added later?

Also, can anyone describe what it is in Song Shan Shaolin?

I have a tape of the Mantis set, but I donot think it is the actual 18 Louhan Hands, I think it is something called that in Mantis lineages and has it's own purpose and intent.

Also, as *I* understand it, the 18 Louhan Hands is a very important Qi Gong set of Shaolin. This being so, how come there is no video on it from Shaolin? We see Xue Xui Jing, and Yi Jin Jing, why not 18 Louhan? The martial sets are around, why not the Qi Gong?