diff --git a/api/__init__.py b/api/__init__.py
index dde87a2..a37ccdd 100644
--- a/api/__init__.py
+++ b/api/__init__.py
@@ -46,9 +46,9 @@ from .s9_demands import get_demand_schema, get_demand, set_demand
 from .s10_status import LINK_STATUS_OPEN, LINK_STATUS_CLOSED, LINK_STATUS_ACTIVE
 from .s10_status import get_status_schema, get_status, set_status
 
-from .s11_patterns import get_pattern_schema, get_pattern, set_pattern
+from .s11_patterns import get_pattern_schema, get_pattern, set_pattern, add_pattern, delete_pattern
 
-from .s12_curves import get_curve_schema, get_curve, set_curve
+from .s12_curves import get_curve_schema, get_curve, set_curve, add_curve, delete_curve
 
 from .s13_controls import get_control_schema, get_control, set_control
 
diff --git a/api/s11_patterns.py b/api/s11_patterns.py
index 96e6ce2..f8ceb6e 100644
--- a/api/s11_patterns.py
+++ b/api/s11_patterns.py
@@ -39,11 +39,29 @@ def set_pattern_cache(name: str, cs: ChangeSet) -> SqlChangeSet:
     for f_factor in old['factors']:
         undo_sql += f"\ninsert into patterns (id, factor) values ({f_id}, {f_factor});"
 
-    redo_cs = g_update_prefix | { 'type': 'pattern' } | new
-    undo_cs = g_update_prefix | { 'type': 'pattern' } | old
+    redo_cs = { 'type': 'pattern' } | new
+    undo_cs = { 'type': 'pattern' } | old
 
     return SqlChangeSet(redo_sql, undo_sql, redo_cs, undo_cs)
 
 
 def set_pattern(name: str, cs: ChangeSet) -> ChangeSet:
-    return execute_command(name, set_pattern_cache(name, cs))
+    result = set_pattern_cache(name, cs)
+    result.redo_cs |= g_update_prefix
+    result.undo_cs |= g_update_prefix
+    return execute_command(name, result)
+
+
+def add_pattern(name: str, cs: ChangeSet) -> ChangeSet:
+    result = set_pattern_cache(name, cs)
+    result.redo_cs |= g_add_prefix
+    result.undo_cs |= g_delete_prefix
+    return execute_command(name, result)
+
+
+def delete_pattern(name: str, cs: ChangeSet) -> ChangeSet:
+    cs.operations[0]['factors'] = []
+    result = set_pattern_cache(name, cs)
+    result.redo_cs |= g_delete_prefix
+    result.undo_cs |= g_add_prefix
+    return execute_command(name, result)
diff --git a/api/s12_curves.py b/api/s12_curves.py
index 4edc159..14bc2ba 100644
--- a/api/s12_curves.py
+++ b/api/s12_curves.py
@@ -43,11 +43,29 @@ def set_curve_cache(name: str, cs: ChangeSet) -> SqlChangeSet:
         f_x, f_y = xy['x'], xy['y']
         undo_sql += f"\ninsert into curves (id, x, y) values ({f_id}, {f_x}, {f_y});"
 
-    redo_cs = g_update_prefix | { 'type': 'curve' } | new
-    undo_cs = g_update_prefix | { 'type': 'curve' } | old
+    redo_cs = { 'type': 'curve' } | new
+    undo_cs = { 'type': 'curve' } | old
 
     return SqlChangeSet(redo_sql, undo_sql, redo_cs, undo_cs)
 
 
 def set_curve(name: str, cs: ChangeSet) -> ChangeSet:
-    return execute_command(name, set_curve_cache(name, cs))
+    result = set_curve_cache(name, cs)
+    result.redo_cs |= g_update_prefix
+    result.undo_cs |= g_update_prefix
+    return execute_command(name, result)
+
+
+def add_curve(name: str, cs: ChangeSet) -> ChangeSet:
+    result = set_curve_cache(name, cs)
+    result.redo_cs |= g_add_prefix
+    result.undo_cs |= g_delete_prefix
+    return execute_command(name, result)
+
+
+def delete_curve(name: str, cs: ChangeSet) -> ChangeSet:
+    cs.operations[0]['coords'] = []
+    result = set_curve_cache(name, cs)
+    result.redo_cs |= g_delete_prefix
+    result.undo_cs |= g_add_prefix
+    return execute_command(name, result)
diff --git a/tjnetwork.py b/tjnetwork.py
index 31c5a3d..862bb24 100644
--- a/tjnetwork.py
+++ b/tjnetwork.py
@@ -398,6 +398,12 @@ def get_pattern(name: str, id: str) -> dict[str, Any]:
 def set_pattern(name: str, cs: ChangeSet) -> ChangeSet:
     return api.set_pattern(name, cs)
 
+def add_pattern(name: str, cs: ChangeSet) -> ChangeSet:
+    return api.add_pattern(name, cs)
+
+def delete_pattern(name: str, cs: ChangeSet) -> ChangeSet:
+    return api.delete_pattern(name, cs)
+
 
 ############################################################
 # curve 12.[CURVES]
@@ -413,6 +419,12 @@ def get_curve(name: str, id: str) -> dict[str, Any]:
 def set_curve(name: str, cs: ChangeSet) -> ChangeSet:
     return api.set_curve(name, cs)
 
+def add_curve(name: str, cs: ChangeSet) -> ChangeSet:
+    return api.add_curve(name, cs)
+
+def delete_curve(name: str, cs: ChangeSet) -> ChangeSet:
+    return api.delete_curve(name, cs)
+
 
 ############################################################
 # control 12.[CONTROLS]
@@ -430,7 +442,7 @@ def set_control(name: str, cs: ChangeSet) -> ChangeSet:
 
 
 ############################################################
-# rule 12.[CONTROLS]
+# rule 13.[RULES]
 ############################################################
 
 def get_rule_schema(name: str) -> dict[str, dict[str, Any]]:
@@ -460,7 +472,7 @@ def set_emitter(name: str, cs: ChangeSet) -> ChangeSet:
 
 
 ############################################################
-# time 21.[EMITTERS]
+# time 21.[TIMES]
 ############################################################
 
 def get_time_schema(name: str) -> dict[str, dict[str, Any]]: