diff --git a/mapytex/calculus/core/str2.py b/mapytex/calculus/core/str2.py
index a7098d4..dfefd17 100644
--- a/mapytex/calculus/core/str2.py
+++ b/mapytex/calculus/core/str2.py
@@ -818,31 +818,8 @@ def rdstr2(sink):
     >>> rdstr2list = rdstr2(list_sink)
     >>> rdstr2list("{a}+{a*b}-2")
     [<RdLeaf a>, '+', <RdLeaf a*b>, '+', <MOnumber - 2>]
-    """
-    lfop = lookfor(is_operator)
-    operator_corout = partial(concurent_broadcast, lookfors=[lfop])
-
-    def pipeline(expression):
-        str2_corout = look_for_rdleaf(
-            lookforNumbers(operator_corout(missing_times(moify_cor(pparser(sink)))))
-        )
-
-        for i in expression.replace(" ", ""):
-            str2_corout.send(i)
-        a = str2_corout.throw(STOOOP)
-
-        return a
-
-    return pipeline
-
-
-def rdstr2(sink):
-    """ Return a pipeline which parse random expression and with sink as endpoint
-
-    :example:
-    >>> rdstr2list = rdstr2(list_sink)
-    >>> rdstr2list("{a}+{a*b}-2")
-    [<RdLeaf a>, '+', <RdLeaf a*b>, '+', <MOnumber - 2>]
+    >>> rdstr2list("{a}({b}x+{c})")
+    [<RdLeaf a>, [<RdLeaf b>, <MOstr x>, '+', <RdLeaf c>]]
     """
     lfop = lookfor(is_operator)
     operator_corout = partial(concurent_broadcast, lookfors=[lfop])