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## Decomposition of $S_{12}^{\mathrm{old}}(2)$ into lower level spaces

$S_{12}^{\mathrm{old}}(2)$ $\cong$ $\href{ /ModularForm/GL2/Q/holomorphic/1/12/1/ }{ S^{ new }_{ 12 }(\Gamma_0(1)) }^{\oplus 2 }$