#Datafile format: 
# The puzzle is made up of 200 small rectangles (20 x 10)
# The columns are labelled a, b, c, ..., t.  The rows are
# are labelled 1, 2, ..., 10 in Excel style.  The big rectangles
# are described by <upper-left><period><lower-right>
# This file contains a considerable subset of all
# possibilities after inspection of the puzzle and removing
# the big rectangles that can be proven to not be possible.
c1, 9, a1.c3
f1, 2, f1.f2
h1, 6, g1.l1, g1.i2
o1, 8, j1.q1, k1.r1, l1.s1, m1.t1, n1.q2
m2, 8, g2.n2, j2.q2, j1.m2
r2, 6, o2.t2, r1.t2
e3, 6, d1.e3
k3, 7, f3.l3
a4, 6, a4.c5
h4, 6, d4.i4
q4, 6, q3.r5
t4, 4, s3.t4
k5, 9, j4.l6
n5, 12, m3.p5
s5, 2, s5.t5
f6, 12, d5.g7
h6, 4, h5.i6
p6, 8, m6.t6
c7, 6, a6.c7
j7, 6, h7.m7, h7.j8
o7, 4, m7.p7, n7.q7, o7.p8
t7, 4, t7.t10
l8, 12, k7.m10, l7.n10, k7.n9, k8.n10, j8.m10
q8, 2, q7.q8, p8.q8, q8.q9
g9, 6, f8.g10
o9, 6, n8.o10, o8.p10, n8.p9, n9.p10
s9, 8, r7.s10
a10, 6, a8.b10
e10, 9, c8.e10
i10, 6, h8.i10, i8.j10, h9.j10
q10, 4, n10.q10, p9.q10