Here’s a Sequence Transposition cipher:
YUOTW TOEAH NHCSS TFEND WDEOT MNEAA TNOSO INBOO OULOW TNPNI RTSPT NKOTT ONOUT WGTHI IDAEA LDINE HAUAE OFRTA OTBDH OTOC 6
The crib is “TOPOFAMOUNTAIN” located above OOOULOWTNPNIRT, or more accurately, beginning at the 39th letter of the plaintext since the ciphertext letters at that point do not relate to the crib. I wrote a program that identifies the most likely primers given the ct, a crib, and the crib placement, assuming sufficient crib length. For this example my program placed the correct primer tied for 5th most likely along with 39 other primers. As an added hint, the check number at the end is 6.
The text is a random sentence from Gutenberg.org.