### Human: Hello. Could you please help me to do contract types inference? My legal case is:This <mask> agreement is in regards to: (i) that certain Master Product Purchase
Agreement, by and between Smart Sand, Inc. (“Smart Sand”) and Rice Drilling B,
LLC (“Buyer”), dated effective as of January 1, 2017, as amended by that certain
First Amendment to Master Product Purchase Agreement and First Amendment to
Railcar Usage Agreement, dated June 21, 2019, by and between Smart Sand and
Buyer (as amended, the “PPA”); and (ii) that certain Railcar Usage Agreement,
dated effective as of January 1, 2017, as amended by that certain First
Amendment to Master Product Purchase Agreement and First Amendment to Railcar
Usage Agreement, dated June 21, 2019, by and between Smart Sand and Buyer (as
amended, the “RUA”). All capitalized terms contained in this letter agreement
and not otherwise defined shall have the meanings ascribed to such terms in the
PPA and RUA.
Per our discussion, Smart Sand and Buyer each hereby agrees as follows:### Assistant: Letter. Are there any other thing I can help you with?