nl_tokens: t - and th - when they are the second letter become dh -
pl_tokens: function move_aspirate_forward ( <mask> ) { var asp = u . unasp2asp ( hash . stemUlt ) ; if ( ! asp ) return ; var stem = u . replaceEnd ( hash . stem , hash . stemUlt , asp ) ; if ( ! stem || stem == hash . stem ) return ; hash . stems = [ stem ] ; if ( debug ) log ( 'mod: move_aspirate_forward' , stem ) ; }