#13-17: "Pearl Necklace" Masyu

made on 12/02/20

Every tile the loop passes over follows the rules of a pearl.

https://puzz.link/p?mashu/v:/6/6/0209000009i0

https://puzz.link/p?mashu/v:/7/6/36000000000000

https://puzz.link/p?mashu/v:/7/7/01000209000000090

https://puzz.link/p?mashu/v:/12/12/0000000000000000000002i002i000002000000000000000

https://puzz.link/p?mashu/v:/11/9/010000003k0000000000000j3000000i0

There is an easier way to rephrase the rules, which you will probably come across and switch to using while solving.