diff --git a/tests.sql b/tests.sql
index fac49bb..0900304 100644
--- a/tests.sql
+++ b/tests.sql
@@ -25,10 +25,10 @@ insert into figures (name, way) values ('fig5',ST_GeomFromText('LINESTRING(0 39,
 insert into figures (name, way) values ('fig6',ST_GeomFromText('LINESTRING(84 47,91 59,114 64,122 80,116 92,110 93,106 106,117 118,136 107,135 76,120 45,125 39,141 39,147 32)'));
 insert into figures (name, way) values ('fig6-rev',ST_Reverse(ST_Translate((select way from figures where name='fig6'), 60, 0)));
 insert into figures (name, way) values ('fig6-combi',
-  ST_LineMerge(ST_Union(
+  ST_Union(
       ST_Translate((select way from figures where name='fig6'), 0, 90),
       ST_Translate((select way from figures where name='fig6'), 80, 90)
-  ))
+  )
 );
 insert into figures (name, way) values ('inflection-1',ST_GeomFromText('LINESTRING(110 24,114 20,133 20,145 15,145 0,136 5,123 7,114 7,111 2)'));
 insert into figures (name, way) values ('multi-island',ST_GeomFromText('MULTILINESTRING((-15 10,-10 10,-5 11,0 11,5 11,10 10,11 9,13 10,15 9),(-5 11,-2 15,0 16,2 15,5 11))'));
@@ -64,7 +64,7 @@ $$ language plpgsql;
 -- COMBINED
 drop table if exists demo_wm;
 create table demo_wm (name text, i bigint, way geometry);
-insert into demo_wm (name, way) select name, ST_SimplifyWM(way, name) from figures where name='fig6-combi';
+insert into demo_wm (name, way) select name, ST_SimplifyWM(way, name) from figures;
 
 do $$
 declare
@@ -125,25 +125,10 @@ begin
     ) from (select unnest(vcrossings) way) a)
   );
 
-  elems1 = array((select way from debug_wm where stage='cinflections' and name='fig6-combi' and gen=1));
-  elems2 = (select ways from inflections where name='fig6-combi');
-
-  foreach elem in array elems1 loop
-    raise notice 'elem 1: %', st_astext(elem);
-  end loop;
-
-  foreach elem in array elems2 loop
-    raise notice 'elem 2: %', st_astext(elem);
-  end loop;
-
-
-  select (self_crossing(elems1)).* into vcrossings, mutated;
-  --select (self_crossing(elems2)).* into vcrossings, mutated;
-  --select (self_crossing((select ways from inflections where name='fig6-combi'))).* into vcrossings, mutated;
-  --select (self_crossing(array((select way from debug_wm where stage='cinflections' and name='fig6-combi')))).* into vcrossings, mutated;
+  select (self_crossing(array((select way from debug_wm where stage='cinflections' and name='fig6-combi' and gen=1)))).* into vcrossings, mutated;
   perform assert_equals(true, mutated);
   perform assert_equals(
-    'LINESTRING(84 137,91 149,114 154,120 135,125 129,141 129,147 122,164 137,171 149,194 154,200 135,205 129,221 129,227 122)',
+    'MULTILINESTRING((84 137,91 149,114 154,120 135,125 129,141 129,147 122),(164 137,171 149,194 154,200 135,205 129,221 129,227 122))',
     (select st_astext(
         st_linemerge(st_union(way))
     ) from (select unnest(vcrossings) way) a)
diff --git a/wm.sql b/wm.sql
index 7c16cb4..f4f2706 100644
--- a/wm.sql
+++ b/wm.sql
@@ -13,7 +13,13 @@ declare
   bend geometry;
   prev_sign int4;
   cur_sign int4;
+  l_type text;
 begin
+  --l_type = st_geometrytype(line);
+  --if l_type != 'ST_LineString' then
+  --  raise 'This function works with ST_LineString, got %', l_type;
+  --end if;
+
   -- The last vertex is iterated over twice, because the algorithm uses 3
   -- vertices to calculate the angle between them.
   --
@@ -323,7 +329,7 @@ $$ language plpgsql;
 drop function if exists ST_SimplifyWM;
 create function ST_SimplifyWM(geom geometry, dbgname text default null) returns geometry as $$
 declare
-  dbg_stage integer;
+  stagenum integer;
   i integer;
   line geometry;
   lines geometry[];
@@ -342,13 +348,13 @@ begin
 
   for i in 1..array_length(lines, 1) loop
     mutated = true;
-    dbg_stage = 1;
+    stagenum = 1;
     while mutated loop
       if dbgname is not null then
         insert into debug_wm (stage, name, gen, nbend, way) values(
           'afigures',
           dbgname,
-          dbg_stage,
+          stagenum,
           i,
           lines[i]
         );
@@ -360,20 +366,19 @@ begin
         insert into debug_wm(stage, name, gen, nbend, way) values(
           'bbends',
           dbgname,
-          dbg_stage,
+          stagenum,
           generate_subscripts(bends, 1),
           unnest(bends)
         );
       end if;
 
-      raise notice 'before inflections: %', dbg_geomsummary(bends);
       bends = fix_gentle_inflections(bends);
 
       if dbgname is not null then
         insert into debug_wm(stage, name, gen, nbend, way) values(
           'cinflections',
           dbgname,
-          dbg_stage,
+          stagenum,
           generate_subscripts(bends, 1),
           unnest(bends)
         );
@@ -385,7 +390,7 @@ begin
         insert into debug_wm(stage, name, gen, nbend, way) values(
           'dcrossings',
           dbgname,
-          dbg_stage,
+          stagenum,
           generate_subscripts(bends, 1),
           unnest(bends)
         );
@@ -393,7 +398,7 @@ begin
 
       if mutated then
         lines[i] = st_linemerge(st_union(bends));
-        dbg_stage = dbg_stage + 1;
+        stagenum = stagenum + 1;
         continue;
       end if;