Add spanning tree path to cosets.

example/CMakeLists.txt

@@ -1,2 +1,5 @@
 add_executable(bench bench.cpp)
 target_link_libraries(bench PRIVATE tc)
+
+add_executable(path path.cpp)
+target_link_libraries(path PRIVATE tc)

example/path.cpp

@@ -0,0 +1,17 @@
+#include "solver.h"
+#include "groups.h"
+
+#include <ctime>
+#include <iostream>
+
+int main() {
+    auto cube = tc::group::B(3);
+    auto vars = tc::solve(cube, {});
+
+    for (int target = 1; target < vars.len; target++) {
+        auto &action = vars.path[target];
+        std::cout << action.coset << " " << action.gen << " " << target << std::endl;
+    }
+
+    return 0;
+}