Total 44
(or 46 when the symmetric cases, quaternary aa/aa and binary cc/ff are included).
The 12-slant tours are those whose four central angles are of the types a, c, f, m, each formed of 2 slants. In the 12-slant tours the consonant and vowel nets must be divided 2:4 or 3:3. The ac/ac is the only one with both divided 2:4. The 28 cases with one 2:4 and one 3:3 are those including an odd number (1 or 3) of 'c' angles. The other 17 cases have both divisions 3:3, including the symmetric aa/aa and cc/ff.
14 tours aa/aa to ac/ac.
15 tours, ac/af to ac/ff
15 tours, ac/fm to cf/ff
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