Constrained specification mining enables the automatic discovery of desired properties from system traces. Generalized Reactivity of Rank 1, or GR(1), is a fragment of LTL with polynomial-time synthesis that natively encodes assume-guarantee properties present in most hardware and robotics domains. In this paper, we present GR1MINE, a SAT-based tool for efficiently learning GR(1) formulas from examples. We exploit the GR(1) temporal skeleton to incrementally enumerate formula candidates, leveraging learnt clauses to avoid recomputation. On the Boolean GR(1) Syntech suite, GR1MINE learns a realizable formula for all 60 benchmarks over 30X faster than generic and constrained LTL mining tools. On non-GR(1) specifications from SYNTCOMP, GR1MINE is still able to recover >2X more realizable specifications than baselines within the timeout.

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