--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/foosdk/sdk/pfc/primitives_part2.h	Mon Jan 05 02:15:46 2026 -0500
@@ -0,0 +1,26 @@
+#pragma once
+
+namespace pfc {
+	template<typename t_list1, typename t_list2>
+	static bool guess_reorder_pattern(pfc::array_t<t_size> & out, const t_list1 & from, const t_list2 & to) {
+		typedef typename t_list1::t_item t_item;
+		const t_size count = from.get_size();
+		if (count != to.get_size()) return false;
+		out.set_size(count);
+		for(t_size walk = 0; walk < count; ++walk) out[walk] = walk;
+		//required output: to[n] = from[out[n]];
+		typedef pfc::chain_list_v2_t<t_size> t_queue;
+		pfc::map_t<t_item, t_queue > content;
+		for(t_size walk = 0; walk < count; ++walk) {
+			content.find_or_add(from[walk]).add_item(walk);
+		}
+		for(t_size walk = 0; walk < count; ++walk) {
+			t_queue * q = content.query_ptr(to[walk]);
+			if (q == NULL) return false;
+			if (q->get_count() == 0) return false;
+			out[walk] = *q->first();
+			q->remove(q->first());
+		}
+		return true;
+	}
+}