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posts.forEach((post, index, arr) => {
post.node.frontmatter.category.forEach(cat => categories.push(cat))
const prev = arr[index - 1]
const next = arr[index + 1]
path: post.node.fields.slug,
component: blogLayout,
context: {
slug: post.node.fields.slug,
prev: prev,
next: next,
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