roles:
- [host.a, client.0]
- [host.b, client.1]
- [host.c, client.2]
- [host.d, client.3]
- [host.e, client.4]
- [host.f, client.5]
- [host.g, client.6]
- [host.h, client.7]
- [host.i, client.8]
- [host.j, client.9]
- [host.k, client.10]
- [host.l, client.11]
- [host.m, client.12]
- [host.n, client.13]
- [host.o, client.14]
- [host.p, client.15]
- [host.q, client.16]
- [host.r, client.17]
- [host.s, client.18]
- [host.t, client.19]
- [host.u, client.20]