commons-rng-sampling/src/main/java/org/apache/commons/rng/sampling/distribution/AhrensDieterMarsagliaTsangGammaSampler.java [295:328]:
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    @Override
    public double sample() {
        return delegate.sample();
    }

    /** {@inheritDoc} */
    @Override
    public String toString() {
        return delegate.toString();
    }

    /**
     * {@inheritDoc}
     *
     * @since 1.3
     */
    @Override
    public SharedStateContinuousSampler withUniformRandomProvider(UniformRandomProvider rng) {
        // Direct return of the optimised sampler
        return delegate.withUniformRandomProvider(rng);
    }

    /**
     * Creates a new gamma distribution sampler.
     *
     * @param rng Generator of uniformly distributed random numbers.
     * @param alpha Alpha parameter of the distribution (this is a shape parameter).
     * @param theta Theta parameter of the distribution (this is a scale parameter).
     * @return the sampler
     * @throws IllegalArgumentException if {@code alpha <= 0} or {@code theta <= 0}
     * @since 1.3
     */
    public static SharedStateContinuousSampler of(UniformRandomProvider rng,
                                                  double alpha,
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commons-rng-sampling/src/main/java/org/apache/commons/rng/sampling/distribution/ChengBetaSampler.java [329:361]:
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    @Override
    public double sample() {
        return delegate.sample();
    }

    /** {@inheritDoc} */
    @Override
    public String toString() {
        return delegate.toString();
    }

    /**
     * {@inheritDoc}
     *
     * @since 1.3
     */
    @Override
    public SharedStateContinuousSampler withUniformRandomProvider(UniformRandomProvider rng) {
        return delegate.withUniformRandomProvider(rng);
    }

    /**
     * Creates a new beta distribution sampler.
     *
     * @param rng Generator of uniformly distributed random numbers.
     * @param alpha Distribution first shape parameter.
     * @param beta Distribution second shape parameter.
     * @return the sampler
     * @throws IllegalArgumentException if {@code alpha <= 0} or {@code beta <= 0}
     * @since 1.3
     */
    public static SharedStateContinuousSampler of(UniformRandomProvider rng,
                                                  double alpha,
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