diff --git a/flow/util/cell-veneer/lefdef.tcl b/flow/util/cell-veneer/lefdef.tcl
index d95a108166..901fd13706 100644
--- a/flow/util/cell-veneer/lefdef.tcl
+++ b/flow/util/cell-veneer/lefdef.tcl
@@ -312,9 +312,8 @@ proc write { design } {
     out "  ORIGIN 0.0 0.0 ;"
   }
   out "  FOREIGN [dict get $design foreign ref] [dict get $design foreign origin] ;"
-  out [concat \
-    "  SIZE [expr 1.0 * [lindex [dict get $design die_area] 2] / $def_units]" \
-    " BY [expr 1.0 * [lindex [dict get $design die_area] 3] / $def_units] ;"]
+  out "  SIZE [expr 1.0 * [lindex [dict get $design die_area] 2] / $def_units]\
+     BY [expr 1.0 * [lindex [dict get $design die_area] 3] / $def_units] ;"
   out "  SYMMETRY [dict get $design symmetry] ;"
   if { [dict exists $design site] } {
     out "  SITE [dict get $design site] ;"
@@ -344,10 +343,10 @@ proc write { design } {
             set rect [absolute_rectangle [dict get $shape rect] $offset]
 
             if { [dict exists $shape mask] } {
-              out [concat \
-                "         RECT MASK [dict get $shape mask]" \
-                " [lmap x $rect { expr { 1.0 * $x / $def_units } }]" \
-                " ;"]
+              out \
+                "         RECT MASK [dict get $shape mask]\
+                 [lmap x $rect { expr { 1.0 * $x / $def_units } }] \
+                 ;"
             } else {
               out "         RECT [lmap x $rect { expr 1.0 * $x / $def_units }] ;"
             }
@@ -383,10 +382,9 @@ proc write { design } {
         out "    LAYER $layer_name ;"
         foreach obs $obstructions {
           if { [dict exists $obs mask] } {
-            out [concat \
-              "      RECT MASK [dict get $obs mask]" \
-              " [lmap x [dict get $obs rect] { expr { 1.0 * $x / $def_units } }]" \
-              " ;"]
+            out "      RECT MASK [dict get $obs mask]\
+               [lmap x [dict get $obs rect] { expr { 1.0 * $x / $def_units } }]
+               ;"
           } else {
             out "      RECT [lmap x [dict get $obs rect] { expr 1.0 * $x / $def_units }] ;"
           }
@@ -740,9 +738,8 @@ proc write { design } {
   }
 
   out ""
-  out [concat \
-    "DIEAREA ( [lrange [dict get $design die_area] 0 1] )" \
-    " ( [lrange [dict get $design die_area] 2 3] ) ;"]
+  out "DIEAREA ( [lrange [dict get $design die_area] 0 1] )\
+     ( [lrange [dict get $design die_area] 2 3] ) ;"
 
   if { [dict exists $design tracks] } {
 
@@ -756,9 +753,8 @@ proc write { design } {
         [dict get $design rows $idx start] \
         [dict get $design rows $idx height] \
         [dict get $design rows $idx orientation]]
-      out [concat \
-        " DO [dict get $design rows $idx num_sites] BY 1 STEP " \
-        "[dict get $design rows $idx site_width] 0 ;"]
+      out " DO [dict get $design rows $idx num_sites] BY 1 STEP\
+        [dict get $design rows $idx site_width] 0 ;"
     }
   }
 
@@ -766,9 +762,9 @@ proc write { design } {
     out ""
     out "PINS [dict size [dict get $design pins]] ;"
     dict for {pin_name pin} [dict get $design pins] {
-      out -nonewline [concat \
-        "- $pin_name + NET [dict get $pin net_name]" \
-        "+ DIRECTION [dict get $pin direction]"]
+      out -nonewline \
+        "- $pin_name + NET [dict get $pin net_name]\
+        + DIRECTION [dict get $pin direction]"
       if { [dict exists $pin use] } {
         out -nonewline " + USE [dict get $pin use]"
       }
@@ -866,9 +862,9 @@ proc write { design } {
               set mask ""
             }
             if { [llength $point] == 2 } {
-              out -nonewline [concat \
-                "  + $type [dict get $route layer] " \
-                "[get_line_width [dict get $route layer] [list $first_point $point]] "]
+              out -nonewline \
+                "  + $type [dict get $route layer]\
+                [get_line_width [dict get $route layer] [list $first_point $point]] "
               out -nonewline $shape
               out -nonewline $points
               out -nonewline $mask
@@ -899,19 +895,19 @@ proc write { design } {
       }
       if { [dict exists $net routes] } {
         set route [lindex [dict get $net routes] 0]
-        out -nonewline [concat \
-          "  + ROUTED [dict get $route layer] " \
-          "[expr round([dict get $route width])] " \
-          "+ SHAPE [dict get $route shape] "]
+        out -nonewline \
+          "  + ROUTED [dict get $route layer]\
+          [expr round([dict get $route width])]\
+          + SHAPE [dict get $route shape] "
         foreach point [dict get $route points] {
           out -nonewline " $point"
         }
         out ""
 
         foreach route [lrange [dict get $net routes] 1 end] {
-          out [concat \
-            "    NEW [dict get $route layer] [expr round([dict get $route width])]" \
-            "+ SHAPE [dict get $route shape] "]
+          out \
+            "    NEW [dict get $route layer] [expr round([dict get $route width])]\
+            + SHAPE [dict get $route shape] "
           foreach point [dict get $route points] {
             out -nonewline " $point"
           }