diff --git a/src/core/rudiments.Segmentable.scala b/src/core/rudiments.Segmentable.scala
index f27b055..acab3e7 100644
--- a/src/core/rudiments.Segmentable.scala
+++ b/src/core/rudiments.Segmentable.scala
@@ -5,13 +5,13 @@ import anticipation.*
 
 object Segmentable:
   given [ElementType] => IndexedSeq[ElementType] is Segmentable =
-    (seq, interval) => seq.slice(interval.start.n0, interval.end.n1)
+    (seq, interval) => seq.slice(interval.start.n0, interval.end.n0)
 
   given [ElementType] => IArray[ElementType] is Segmentable as iarray =
-    (iarray, interval) => iarray.slice(interval.start.n0, interval.end.n1)
+    (iarray, interval) => iarray.slice(interval.start.n0, interval.end.n0)
 
   given Text is Segmentable = (text, interval) =>
-    text.s.substring(interval.start.n0, interval.end.n1).nn.tt
+    text.s.substring(interval.start.n0, interval.end.n0).nn.tt
 
 trait Segmentable:
   type Self
diff --git a/src/core/soundness+rudiments-core.scala b/src/core/soundness+rudiments-core.scala
index 455a93a..6e0cea6 100644
--- a/src/core/soundness+rudiments-core.scala
+++ b/src/core/soundness+rudiments-core.scala
@@ -27,7 +27,7 @@ export rudiments.{ByteSize, bin, hex, Hex, b, kb, mb, gb, tb, byteSize, sift, ha
     Exit, Pid, Quickstart, Nat, Label, unit, waive, twin, triple, is, matchable, give, pipe,
     tap, also, Counter, loop, Loop, &, tuple, to, WorkingDirectoryError, HomeDirectoryError,
     WorkingDirectory, HomeDirectory, workingDirectory, homeDirectory, Bond, binds, bound, prim, sec,
-    ter, unwind, at, Indexable, yet, Capability, Bijection, bijection}
+    ter, unwind, at, Indexable, yet, Capability, Bijection, bijection, segment, Segmentable}
 
 package quickstart:
   export rudiments.quickstart.defaults as defaults