_FindFreeAreaInGroup
if (_FindFreeAreaInGroup(group, Corner::kLeftTop))
if (_FindFreeAreaInGroup(group, Corner::kRightTop))
if (_FindFreeAreaInGroup(group, Corner::kLeftBottom))
if (_FindFreeAreaInGroup(group, Corner::kRightBottom))
if (_FindFreeAreaInGroup(group)) {
bool _FindFreeAreaInGroup(SATGroup* group);
bool _FindFreeAreaInGroup(SATGroup* group,