Lao tone makrs have xj, xh, xH, xJ. 

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No Written Tone Mark   dk / kaa djk dhk dHk dJk g9k / caw g9jk g9hk g9Hk g9Jk g0nv/kfa g0njv g0nhv     glqk/saw glqjk glqhk     fu/ dii fuj fuh fuH fuJ g8/ tee g8j g8h g8H g8J g[p/ bia g[jp g[hp g[Hp g[Jp wx/ pay wxj wxh wxH wxJ c1/ yee c1j c1h c1H c1J 3v/ ?oo 3vj 3vh 3vH 3vJ