eulerPosts.forEach(({ node }, index) => {
    // pagination for link to next solution
    const prev = index === 0 ? false : eulerPosts[index - 1].node;
    const next = index === posts.length ? false : eulerPosts[index + 1].node;

    createPage({
      component: eulerTemplate,
      path: `euler${node.fields.slug}`,
      context: {
        slug: node.fields.slug,
        prev: prev,
        next: next,
      },
    });