diff --git a/.gitignore b/.gitignore
index b70ae2e..20157f7 100644
--- a/.gitignore
+++ b/.gitignore
@@ -23,6 +23,7 @@ notes
 /temp
 *~
 q
+scratch.clj
 
 # Clojure Script
 .shadow-cljs/
diff --git a/src/propeller/gp.cljc b/src/propeller/gp.cljc
index 2f63c9d..98e6ca7 100644
--- a/src/propeller/gp.cljc
+++ b/src/propeller/gp.cljc
@@ -61,6 +61,7 @@
          :bmx-complementary?          false ; for bmx, whether mates selected using reverse case sequence of first parent
          :bmx-maximum-distance        1000000 ; for bmx, don't exchange if distance is greater than this
          :bmx-same-gene-count         false ; for bmx, only allow exchanges between individuals with same number of genes
+         :closes                      :specified ; :pecified, :balanced, :none
          :custom-report               false ; if provided, should be a function that takes an argmap
          :dont-end                    false ; if true, keep running until limit regardless of success
          :downsample?                 true ; wether to use downsampling
diff --git a/src/propeller/push/instructions.cljc b/src/propeller/push/instructions.cljc
index 4f65c3c..9e7094d 100644
--- a/src/propeller/push/instructions.cljc
+++ b/src/propeller/push/instructions.cljc
@@ -12,39 +12,6 @@
 can be either constant literals or functions that take and return a Push state"
   (atom (hash-map)))
 
-;; Number of blocks opened by instructions (default = 0)
-(def opens
-  "Number of blocks opened by instructions. The default is 0."
-  {:exec_dup 1
-            :exec_dup_times 1
-            :exec_dup_items 0 ; explicitly set to 0 to make it clear that this is intended
-            :exec_eq 0 ; explicitly set to 0 to make it clear that this is intended
-            :exec_pop 1
-            :exec_rot 3
-            :exec_shove 1
-            :exec_swap 2
-            :exec_yank 0 ; explicitly set to 0 to make it clear that this is intended
-            :exec_yank_dup 0 ; explicitly set to 0 to make it clear that this is intended
-            :exec_deep_dup 0 ; explicitly set to 0 to make it clear that this is intended
-            :exec_print 1
-            :exec_if  2
-            :exec_when 1
-            :exec_while 1
-            :exec_do_while 1
-            :exec_do_range 1
-            :exec_do_count 1
-            :exec_do_times 1
-            :exec_k 2
-            :exec_s 3
-            :exec_y 1
-            :string_iterate 1
-            :vector_boolean_iterate 1
-            :vector_string_iterate 1
-            :vector_integer_iterate 1
-            :vector_float_iterate 1
-            })
-
-
 #?(:clj
    (def ^{:no-doc true} cls->type
      {Boolean    :boolean
diff --git a/src/propeller/push/instructions/parentheses.cljc b/src/propeller/push/instructions/parentheses.cljc
index 8f40fd3..fb77cce 100644
--- a/src/propeller/push/instructions/parentheses.cljc
+++ b/src/propeller/push/instructions/parentheses.cljc
@@ -4,30 +4,29 @@
 (def opens
   "Number of blocks opened by instructions. The default is 0."
   {:exec_dup 1
-            :exec_dup_times 1
-            :exec_dup_items 0 ; explicitly set to 0 to make it clear that this is intended
-            :exec_eq 0 ; explicitly set to 0 to make it clear that this is intended
-            :exec_pop 1
-            :exec_rot 3
-            :exec_shove 1
-            :exec_swap 2
-            :exec_yank 0 ; explicitly set to 0 to make it clear that this is intended
-            :exec_yank_dup 0 ; explicitly set to 0 to make it clear that this is intended
-            :exec_deep_dup 0 ; explicitly set to 0 to make it clear that this is intended
-            :exec_print 1
-            :exec_if  2
-            :exec_when 1
-            :exec_while 1
-            :exec_do_while 1
-            :exec_do_range 1
-            :exec_do_count 1
-            :exec_do_times 1
-            :exec_k 2
-            :exec_s 3
-            :exec_y 1
-            :string_iterate 1
-            :vector_boolean_iterate 1
-            :vector_string_iterate 1
-            :vector_integer_iterate 1
-            :vector_float_iterate 1
-            })
\ No newline at end of file
+   :exec_dup_times 1
+   :exec_dup_items 0 ; explicitly set to 0 to make it clear that this is intended
+   :exec_eq 0 ; explicitly set to 0 to make it clear that this is intended
+   :exec_pop 1
+   :exec_rot 3
+   :exec_shove 1
+   :exec_swap 2
+   :exec_yank 0 ; explicitly set to 0 to make it clear that this is intended
+   :exec_yank_dup 0 ; explicitly set to 0 to make it clear that this is intended
+   :exec_deep_dup 0 ; explicitly set to 0 to make it clear that this is intended
+   :exec_print 1
+   :exec_if  2
+   :exec_when 1
+   :exec_while 1
+   :exec_do_while 1
+   :exec_do_range 1
+   :exec_do_count 1
+   :exec_do_times 1
+   :exec_k 2
+   :exec_s 3
+   :exec_y 1
+   :string_iterate 1
+   :vector_boolean_iterate 1
+   :vector_string_iterate 1
+   :vector_integer_iterate 1
+   :vector_float_iterate 1})