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Doctrinaire puzzle with limited axis system
Rompentrix, the Vertical SmileThis is a subset of the Starminx with two axes, both with a traditional cut and one cut deeper than the origin, in which a rhombus, pentagons and triangles appear.
Septic TwistFour layers in shapes of heptagons can be turned without jumbling and fudging.
TetragramFour axes and four effective sides with the cutting pattern of a Starminx II.

Tetragram IIThe Tetragram with curvy cuts that make two types of pieces visible and one additional turn.
TraheptrixA doctrinaire puzzle with two axes with 3-fold rotation and heptagonal pieces.
TraoctrixA doctrinaire puzzle with two axes with 3-fold rotation and octagonal pieces.

Trapen-KrystShaped as the Trapentrix but with only one of its turns, the other being an edge turn.
Trapen-Kryst essenceA minimalist biaxe triangular prism with just two turns: One in steps of 120°, one in steps of 180°.
TrapentrixA doctrinaire puzzle with two axes with 3-fold rotation and pentagonal pieces.

Trapentrix EssenceA doctrinaire puzzle with two axes with 3-fold rotation and pentagonal pieces, with deeper-than-origin cuts.
TriQuadA non truncated version of Bygride-3-4 with different cuts.
TridecalisA doctrinaire puzzle with two axes with 3-fold rotation and decagonal pieces.

TrientalisA doctrinaire puzzle with two axes with threefold rotation and heptagonal pieces.

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