MOTIVATION
There is only one repeated consonant, and that is the letter T
The vowels are {O,I,A,I,O}
The remaining consonants are {M,V,N}
The vowels can be arranged -- while staying together in one group -- in  5!/(2!*2!) ways or  120/(2*2) = 30 ways
The consonants {M,V,N} can be arranged in 3! = 6 ways
 
Finally, for EACH of these vowel AND consonant arrangements, there are 4 places to put the grouped vowels: 
    T,{vowels},{M,V,N},T
    T,M,{vowels},{V,N},T
    T,V,{vowels},{M,N},T
     etc.
This results in  30 * 6 * 4 =  ways to arrange the letters and satisfy the problem statement.
 ways to arrange the letters and satisfy the problem statement.