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diff --git a/2d/time.scm b/2d/time.scm
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-;;; guile-2d
-;;; Copyright (C) 2013 David Thompson <dthompson2@worcester.edu>
-;;;
-;;; Guile-2d is free software: you can redistribute it and/or modify it
-;;; under the terms of the GNU Lesser General Public License as
-;;; published by the Free Software Foundation, either version 3 of the
-;;; License, or (at your option) any later version.
-;;;
-;;; Guile-2d is distributed in the hope that it will be useful, but
-;;; WITHOUT ANY WARRANTY; without even the implied warranty of
-;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-;;; Lesser General Public License for more details.
-;;;
-;;; You should have received a copy of the GNU Lesser General Public
-;;; License along with this program.  If not, see
-;;; <http://www.gnu.org/licenses/>.
-
-;;; Commentary:
-;;
-;; Time-based signals.
-;;
-;;; Code:
-
-(define-module (2d time)
-  #:use-module (2d agenda)
-  #:use-module (2d coroutine)
-  #:use-module (2d signals)
-  #:export (time-every
-            time-each
-            time-delay))
-
-(define (time-every agenda delay value)
-  "Create a new signal that emits VALUE every DELAY ticks of AGENDA.
-VALUE may be a signal, in which case the stored value of the signal
-will be emitted."
-  (let ((ticker (make-root-signal (signal-ref-maybe value))))
-    (define (tick)
-      (signal-set! ticker (signal-ref-maybe value)))
-    (schedule-interval agenda tick delay)
-    ticker))
-
-(define (time-each agenda value)
-  "Create a new signal that emits VALUE every agenda update."
-  (time-every agenda 1 value))
-
-(define (time-delay agenda delay signal)
-  "Create a new signal that delays propagation of values received from
-SIGNAL by DELAY ticks of AGENDA."
-  (make-signal (signal-ref signal)
-               (colambda (self from)
-                 (let ((value (signal-ref from)))
-                   (wait agenda delay)
-                   (signal-set! self value)))
-               (list signal)))