preorder vs sequence

preorder

verb
  • To sort or arrange beforehand. 

  • To order (goods or services) in advance, before they are available. 

noun
  • A binary relation that is reflexive and transitive. 

  • An order for goods or services placed in advance. 

adj
  • Such that, recursively, the root is visited before the left and right subtrees. 

sequence

verb
  • to arrange in an order 

  • to determine the order of things, especially of amino acids in a protein, or of bases in a nucleic acid 

  • to produce (music) with a sequencer 

noun
  • An ordered list of objects, typically indexed with natural numbers. 

  • A series of shots that depict a single action or style in a film, television show etc. 

  • A series of musical phrases where a theme or melody is repeated, with some change each time, such as in pitch or length (example: opening of Beethoven's Fifth Symphony). 

  • The state of being sequent or following; order of succession. 

  • A musical composition used in some Catholic Masses between the readings. The most famous sequence is the Dies Irae (Day of Wrath) formerly used in funeral services. 

  • A set of things next to each other in a set order; a series 

  • A meld consisting of three or more cards of successive ranks in the same suit, such as the four, five and six of hearts. 

How often have the words preorder and sequence occurred in a corpus of books? (source: Google Ngram Viewer )