diff --git a/label120cell.js b/label120cell.js
index 7064d83..82a1f66 100644
--- a/label120cell.js
+++ b/label120cell.js
@@ -1,5 +1,6 @@
 
-//testbed for playing with stuff in node repl
+// code for generating the 120-cell labels
+// has some overlap with permute - FIXME
 
 const THREE =require('three');
 
@@ -133,7 +134,7 @@ function dist2(n1, n2) {
 	return (n1.x - n2.x) ** 2 + (n1.y - n2.y) ** 2 + (n1.z - n2.z) ** 2 + (n1.w - n2.w) ** 2;
 }
 
-function auto_detect_edges(nodes, neighbours, debug=false) {
+export function auto_detect_edges(nodes, neighbours, debug=false) {
 	const seen = {};
 	const nnodes = nodes.length;
 	const links = [];
@@ -168,7 +169,7 @@ function auto_detect_edges(nodes, neighbours, debug=false) {
 
 
 
-function make_120cell_vertices() {
+export function make_120cell_vertices() {
 	const phi = 0.5 * (1 + Math.sqrt(5));  
 	const r5 = Math.sqrt(5);   
 	const phi2 = phi * phi;    
@@ -230,7 +231,7 @@ function fingerprint(ids) {
 
 
 
-function auto_120cell_faces(links) {
+export function auto_120cell_faces(links) {
 	const faces = [];
 	const seen = {};
 	let id = 1;
@@ -486,7 +487,7 @@ function colour_next_dodeca_maybe(nodes, links, faces, colours, dd, nextf, nextd
 	const nextvs = dodecahedron_vertices(nextdd);
 	// get the initial colour permutations from the existing labels;
 	const p = [];
-	for( i = 0; i < 5; i ++ ) {
+	for( let i = 0; i < 5; i ++ ) {
 		p[i] = colours[nextvs[i]];
 	}
 	const nlabels = colour_dodecahedron_from_face(nextdd, p);
@@ -668,8 +669,9 @@ function arctic(nodes, links, faces, startf, startn, max) {
 
 
 
+// this is the one that works
 
-function arctic_two(nodes, links, faces, startf, startn) {
+export function label_120cell(nodes, links, faces, startf, startn) {
 	const pole = face_plus_to_dodecahedron(faces, startf, startn);
 	const dds = [ pole ];
 
@@ -815,7 +817,6 @@ function make_120cell_cells(faces) {
 		for( const dd of dds ) {
 			const fp = dd_fingerprint(dd);
 			if( ! (fp in seen) ) {
-				//console.log(`added dodeca ${fp}`);
 				const d = {
 					id: i,
 					faces: dd,
@@ -927,6 +928,8 @@ function make_dodecahedron_vertices() {
 }
  
 
+
+
 // const nodes = make_120cell_vertices();
 // const links = auto_detect_edges(nodes, 4);
 // const faces = auto_120cell_faces(links);