diff --git a/src/fn.js b/src/fn.js
index 7e6ab47..d672e1f 100644
--- a/src/fn.js
+++ b/src/fn.js
@@ -35,7 +35,7 @@ export const useWith = curry((fn, tfns) =>
   ))
 
 export const converge = (fn, tfns) => curryN(
-  max(map(length, tfns)),
+  pipe(length, map, max)(tfns),
   (...args) => fn(...map(tfn => tfn(...args), tfns))
 )
 
@@ -68,7 +68,7 @@ export const split = curry((delim, v) => v.split(delim))
 export const max = v => Math.max(...v)
 export const min = v => Math.min(...v)
 export const inc = v => v + 1
-export const dec = v => v + 1
+export const dec = v => v - 1
 
 // arrays
 export const map = curry((fn, v) => v.map(fn))
@@ -103,21 +103,16 @@ export const assocPath = curry((key, value, obj) => pipe(
   mergeRightDeep(obj),
 )(key))
 
-export const mergeLeftDeep = curry((a, b) => {
-  return reduce((acc, key) => {
-    const av = acc[key]
-    const bv = b[key]
-
-    return pipe(
-      ifElse(
-        every(is(Object)),
-        apply(mergeLeftDeep),
-        last
-      ),
-      v => assoc(key, v, acc)
-    )([av, bv])
-  }, a, keys(b))
-})
+export const mergeLeftDeep = curry((a, b) =>
+  reduce((acc, key) => pipe(
+    ifElse(
+      every(is(Object)),
+      apply(mergeLeftDeep),
+      last
+    ),
+    v => assoc(key, v, acc)
+  )([acc[key], b[key]]), a, keys(b))
+)
 
 export const mergeRightDeep = flip(mergeLeftDeep)
 
diff --git a/tests/query.test.js b/tests/query.test.js
index 40941c1..8636992 100644
--- a/tests/query.test.js
+++ b/tests/query.test.js
@@ -29,12 +29,14 @@ describe('query', () => {
             return eid
         }
 
-        const knows = (a, b) => {
-            const edge = addEntity(w)
-            addComponent(w, Knows, edge)
-            Knows.from[edge] = a
-            Knows.to[edge] = b
-            return edge
+        const relate = (a, type, ...b) => {
+            return b.map(v => {
+                const edge = addEntity(w)
+                addComponent(w, type, edge)
+                type.from[edge] = a
+                type.to[edge] = v
+                return edge
+            })
         }
 
         const player = create(Player) // 0
@@ -42,16 +44,10 @@ describe('query', () => {
         const b = create(NPC) // 2
         const c = create(NPC) // 3
 
-        knows(player, a) // 4
-        knows(player, c) // 5
-
-        knows(a, player) // 6
-        knows(a, b) // 7
-        knows(a, c) // 8
-
-        knows(b, a) // 9
-
-        knows(c, player) // 10
+        relate(player, Knows, a, c) // 4, 5
+        relate(a, Knows, player, b, c) // 6, 7, 8
+        relate(b, Knows, a) // 9
+        relate(c, Knows, player) // 10
 
         assert.deepEqual(
             query('MATCH (player:Player) RETURN player', engine).unwrap(),