@itz_kayra I think it can work with triangle ends because I saw some pictures with it. You can also do the teardrop loop with an odd number of strings I’m pretty sure but I’m not exactly remembering how so I would suggest a YouTube video or something. Good luck!
@SilCindy hi! First off, welcome to the BraceletBook community! So as for your question, I would suggest making this pattern with the 11 strings it shows. I don’t know how to make the Greek wave with 13 strings but if you’ve found a tutorial and you really like it or you think you can do it, go ahead! If you don’t, I would suggest trying the 11 string one(this one) and then maybe moving on to the 13 string. And just a disclaimer-it might look a little lopsided at the beginning but keep going and I’m sure you can do it! Have fun!