Composition, surface treatment agent, article, and method of producing article

A composition comprising a first compound and a second compound, wherein the first compound and the second compound are each represented by Formula (A), and at least one of T or Y in Formula (A) differs between the first compound and the second compound:

• wherein, in Formula (A):
• T is a monovalent group,
• each R1 is independently a monovalent hydrocarbon group,
• Y1 is a monovalent hydrocarbon group or a group represented by Formula (1A),
• A is a (q+1)-valent linking group,
• each Y2 is independently a group represented by Formula (S1) or Formula (S3),
• m is a number of 1 or more, and
• q is an integer of 1 or more,
• wherein, in Formula (1A):
• TA is a monovalent group,
• each R1A is independently a monovalent hydrocarbon group,
• ma is a number of 1 or more, and
• *1A is a bonding site to a silicon atom in Formula (A),
• wherein, in Formula (S1):
• each R2 is independently a hydrocarbon group,
• each L is independently a hydrolyzable group, a group having a hydrolyzable group, or a hydroxy group,
• n is an integer from 0 to 2, and
• *S1 is a bonding site to a linking group represented by A in Formula (A),
• wherein, in Formula (S3):
• each L2 is independently a hydrolyzable group, a group having a hydrolyzable group, a hydroxy group, or a hydrocarbon group,
• each of at least four L2s among the L2s is a hydrolyzable group, a group having a hydrolyzable group, or a hydroxy group,
• each P is independently an oxygen atom or an organic group having one carbon atom bonded to adjacent Si atoms,
• r1 is an integer from 1 to 3, and
• *S3 is a bonding site to a linking group represented by A in Formula (A).