[401-402] «Web UPDATED»

Because "[401-402]" can refer to several different things, here are a few reviews tailored to the most likely meanings:

These episodes kicked off Season 4 and are often reviewed together for their world-building and rising tensions. [401-402]

These twin-engine aircraft are known for being workhorses for small airlines and executive travel. The Expanse: Tensions Rise On Both Sides Of The Ring Because "[401-402]" can refer to several different things,

This specific vacation rental is highly rated for its mountain views and convenient "lockoff" setup, which connects two separate units. [401-402]

In academic contexts, these often refer to intermediate economics or Risk Management (ARM) designations.