question: Given the following triplets constituting a sub-graph, please infer the relationship between "programming languages" and "preprocessing".
  Triplets: sentence segmentation - Conjunction - preprocessing; tools for dl - Is-a-Prerequisite-of - programming languages; tools for dl - Is-a-Prerequisite-of - python; text chunking - Conjunction - preprocessing; python - Is-a-Prerequisite-of - preprocessing; Part-of; Conjunction; Evaluate-for; Is-a-Prerequisite-of; Used-for; Hyponym-Of
  Relationships Types: Compare, Part-of, Conjunction, Evaluate-for, Is-a-Prerequisite-of, Used-for, Hyponym-Of