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#Mathematica, 53 bytes

Mathematica, 53 bytes

!Flatten@Table[Tr/@Tuples[{6,9,20},i],{i,#}]~FreeQ~#&

#Mathematica, 53 bytes

!Flatten@Table[Tr/@Tuples[{6,9,20},i],{i,#}]~FreeQ~#&

Mathematica, 53 bytes

!Flatten@Table[Tr/@Tuples[{6,9,20},i],{i,#}]~FreeQ~#&
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#Mathematica, 53 bytes

!Flatten@Table[Tr/@Tuples[{6,9,20},i],{i,#}]~FreeQ~#&