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% replaces any number of letters (la% - lake, lamp)_ replaces one letter (ca_ - car, cat)

Crossword clues for Palindromic rulers:

OTTO: Palindromic ruler
TUT: Palindromic ruler
SHAHS: Palindromic rulers
OTTO: Palindromic Bavarian ruler
SHAHS: Palindromic former rulers
SHAH: Former ruler whose plural is a palindrome