Why ",{dieresis}" has a different behaviour in 1,{dieresis}1 2 3 4 and
b,{dieresis}a?
a{leftarrow}(1 2)(2 3)(4 5)(6 7)
o{leftarrow}{quad}fmt
o a
+4--------------------------+
¦+2---+ +2---+ +2---+ +2---+¦
¦¦ 1 2¦ ¦ 2 3¦ ¦ 4 5¦ ¦ 6 7¦¦
¦+~---+ +~---+ +~---+ +~---+2
+?--------------------------+
b{leftarrow}(0 0)
o b
+2---+
¦ 0 0¦
+~---+
o b,{dieresis}a
LENGTH ERROR
o b,{dieresis}a
?
o 1 2 3 4
+4-------+
¦ 1 2 3 4¦
+~-------+
o 1
1
~
o 1,{dieresis}1 2 3 4
+4--------------------------+
¦+2---+ +2---+ +2---+ +2---+¦
¦¦ 1 1¦ ¦ 1 2¦ ¦ 1 3¦ ¦ 1 4¦¦
¦+~---+ +~---+ +~---+ +~---+2
+?--------------------------+
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