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use crate::ctx::GenContext; pub fn gen(ctx: &mut GenContext<'_>, buf: &mut String) { buf.reserve(11); for i in 0..9 { if i == 3 || i == 6 { buf.push(' '); } let d = ctx.rng.range(0, 9); buf.push((b'0' + d as u8) as char); } }