text t;
data b;

b = "Bangkok";

t = "Bang";

o_form("starts with, embeds, ends with \"~\": ~, ~, ~\n", t, b.seek(t) == 0,
       b.seek(t) != -1,
       b.seek(t) != -1 && b.seek(t) + ~t == ~b);

t = "ok";

o_form("starts with, embeds, ends with \"~\": ~, ~, ~\n", t, b.seek(t) == 0,
       b.seek(t) != -1,
       b.seek(t) != -1 && b.seek(t) + ~t == ~b);

t = "Summer";

o_form("starts with, embeds, ends with \"~\": ~, ~, ~\n", t, b.seek(t) == 0,
       b.seek(t) != -1,
       b.seek(t) != -1 && b.seek(t) + ~t == ~b);