diff --git a/api/s11_patterns.py b/api/s11_patterns.py
index 7b4a6d3..8be3bcd 100644
--- a/api/s11_patterns.py
+++ b/api/s11_patterns.py
@@ -91,3 +91,39 @@ def delete_pattern_cache(name: str, cs: ChangeSet) -> SqlChangeSet:
 
 def delete_pattern(name: str, cs: ChangeSet) -> ChangeSet:
     return execute_command(name, delete_pattern_cache(name, cs))
+
+
+def inp_in_demand(section: list[str]) -> ChangeSet:
+    descs = {}
+    patterns: dict[str, list[float]] = {}
+
+    count = len(section)
+    for i in range(0, count):
+        if section[i].startswith(';'):
+            # this is description
+            next = i + 1
+            if next < count and section[next].startswith(';') == False:
+                next_tokens = section[next].split()
+                descs[next_tokens[0]] = section[i].removeprefix(';')
+            continue
+
+        tokens = section[i].split()
+        if tokens[0] not in patterns:
+            patterns[tokens[0]] = []
+        for token in tokens[1:]:
+            patterns[tokens[0]].append(float(token))
+
+    cs = ChangeSet()
+    for id, factors in patterns.items():
+        cs.append({'operation': API_ADD, 'type': 'pattern', 'id' : id, 'factors' : factors})
+    return cs
+
+
+def inp_out_demand(name: str) -> list[str]:
+    lines = []
+    objs = read_all(name, f"select * from patterns order by _order")
+    for obj in objs:
+        id = obj['id']
+        factor = obj['factor']
+        lines.append(f'{id} {factor}')
+    return lines