If, however, in the case of an injured finger, observation is made of the ridges of the finger itself and indicated on the print, this classification should be, insofar as it is possible, utilized. For example, a missing impression labeled "ulnar loop of about 8 counts" by the individual taking the prints, should be searched in the subsecondary as both I and O but should not be referenced as a pattern other than a loop. If the finger is used as the final, or key, it should be searched enough counts on each side of 8 to allow for possible error in the counting by the contributor using his naked eye. CHAPTER VI _Filing Sequence_ The sequence must be arranged properly at all times to make possible the most accurate work. Prints are sequenced and filed in this order, according to: I. _Primary:_ 1 32. - to -- 1 32 In the primary classification the denominator remains constant until all numerator figures have been exhausted from 1 to 32. All prints with the primary 1 over 1 are filed together. These are followed by 2 over 1, 3 over 1, 4 over 1, etc., until 32 over 1 is reached. The next primary is 1 over 2, then 2 over 2, etc., until 32 over 2 is reached. Eventually, through the use of each denominator figure and the elimination of each numerator over each denominator, the 32 over 32 primary will be reached. Even in the smaller collections of fingerprints, it will be found that the groups which are arranged under the individual primaries filed in sequence, from 1 over 1 to 32 over 32, will be too voluminous for expeditious searching. II. _Secondary:_ A. Secondary small-letter group: A rW3r. - to ---- A rW3r Most intricate of all the individual sequences is the small-letter sequence. It is less difficult if the following method is used: 1. Sequence according to the patterns in the index fingers, grouped A W. - to - A W When small letters are present, there are 25 possible combinations which can appear in the index fingers. They are as follows: A T R U W - - - - - A A A A A A T R U W - - - - - T T T T T A T R U W - - - - - R R R R R A T U R W - - - - - U U U U U A T U R W - - - - - W W W W W 2. Within each group sequence: a. The denominator, by-- (1) Count of the small letters (lesser preceding the greater). (2) Position of the small letters (those to the left preceding those to the right). (3) Type of small letter (sequence a, t, r). b. The numerator, by-- (1) Count. (2) Position. (3) Type. Thus A T - precedes - A A A A --- precedes --- rAt A3t A A -- precedes -- aA Aa A A -- precedes -- At Ar aA aAa --- precedes --- aAr aAr