We present LLCCM, a log-linear variant of the constituent context model (CCM) of
grammar induction. LLCCM retains the simplicity of the original CCM but extends
robustly to long sentences. On sentences of up to length 40, LLCCM outperforms CCM
by 13.9% brack- eting F1 and outperforms a right-branching baseline in regimes
where CCM does not.