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87b3621a74407c44d1b4a9d66bd2c14115188fe4: $$
\color{red} q_0
d8e52b194ec9fb4df8908a438dd0df729b45269d: $$
A
05a188ed6c1b73244a56b73eed7b6d0cd99685f6: $$
L/2