traceryShuffle9.js

var shuffleGrammar = {
    "origin": "#buildstack##element##element##element##element##element##element##element##element##element#",
    "element" : "#stack#[stack:POP]",
    "e1" : "[stack:1][e1:]",
    "e2" : "[stack:2][e2:]",
    "e3" : "[stack:3][e3:]",
    "e4" : "[stack:4][e4:]",
    "e5" : "[stack:5][e5:]",
    "e6" : "[stack:6][e6:]",
    "e7" : "[stack:7][e7:]",
    "e8" : "[stack:8][e8:]",
    "e9" : "[stack:9][e9:]",
    "buildstack" : "#bs16##bs16##bs16##bs16#",
    "bs16" : "#bs4##bs4##bs4##bs4#",
    "bs4" : "#elements##elements##elements##elements#",
    "elements" : [ "#e1#", "#e2#", "#e3#", "#e4#", "#e5#",
		   "#e6#", "#e7#", "#e8#", "#e9#" ]
};

traceryShuffle9Countdown.js

var shuffleGrammar = {
    "origin": "#initcounter##buildstack##element##element##element##element##element##element##element##element##element#",
    "element" : "#stack#[stack:POP]",
    "counter" : "[bs4:][bs16:][buildstack:]",
    "initcounter" : "[counter:][counter:][counter:][counter:][counter:][counter:][counter:][counter:][counter:]",
    "e1" : "[stack:1][e1:][counter:POP]",
    "e2" : "[stack:2][e2:][counter:POP]",
    "e3" : "[stack:3][e3:][counter:POP]",
    "e4" : "[stack:4][e4:][counter:POP]",
    "e5" : "[stack:5][e5:][counter:POP]",
    "e6" : "[stack:6][e6:][counter:POP]",
    "e7" : "[stack:7][e7:][counter:POP]",
    "e8" : "[stack:8][e8:][counter:POP]",
    "e9" : "[stack:9][e9:][counter:POP]",
    "buildstack" : "#bs16##bs16##bs16##bs16#",
    "bs16" : "#bs4##bs4##bs4##bs4#",
    "bs4" : "#bs1##bs1##bs1##bs1#",
    "bs1" : "X#elements##counter#",
    "elements" : [ "#e1#", "#e2#", "#e3#", "#e4#", "#e5#",
		   "#e6#", "#e7#", "#e8#", "#e9#" ]
};

Challenge: write a Tracery grammar that outputs any permutation of 123456789, chosen at random.

My solutions here take a probabilistic approach which will generate an error if they fail to produce a permutation (due to stack underflow.)

The second file revises the approach a little bit to terminate immediately after adding the 9th element to the stack.

We can simplify the second file to use an infinite loop instead:

"buildstack" : ".#elements##counter##buildstack#",